diff --git a/framework/cached-packages/src/libra_framework_sdk_builder.rs b/framework/cached-packages/src/libra_framework_sdk_builder.rs
index 55ccc115c..b09265deb 100644
--- a/framework/cached-packages/src/libra_framework_sdk_builder.rs
+++ b/framework/cached-packages/src/libra_framework_sdk_builder.rs
@@ -2463,7 +2463,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::AccountOfferRotationCapability {
-                rotation_capability_sig_bytes: bcs::from_bytes(script.args().get(0)?).ok()?,
+                rotation_capability_sig_bytes: bcs::from_bytes(script.args().first()?).ok()?,
                 account_scheme: bcs::from_bytes(script.args().get(1)?).ok()?,
                 account_public_key_bytes: bcs::from_bytes(script.args().get(2)?).ok()?,
                 recipient_address: bcs::from_bytes(script.args().get(3)?).ok()?,
@@ -2478,7 +2478,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::AccountOfferSignerCapability {
-                signer_capability_sig_bytes: bcs::from_bytes(script.args().get(0)?).ok()?,
+                signer_capability_sig_bytes: bcs::from_bytes(script.args().first()?).ok()?,
                 account_scheme: bcs::from_bytes(script.args().get(1)?).ok()?,
                 account_public_key_bytes: bcs::from_bytes(script.args().get(2)?).ok()?,
                 recipient_address: bcs::from_bytes(script.args().get(3)?).ok()?,
@@ -2513,7 +2513,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::AccountRevokeRotationCapability {
-                to_be_revoked_address: bcs::from_bytes(script.args().get(0)?).ok()?,
+                to_be_revoked_address: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -2525,7 +2525,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::AccountRevokeSignerCapability {
-                to_be_revoked_address: bcs::from_bytes(script.args().get(0)?).ok()?,
+                to_be_revoked_address: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -2537,7 +2537,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::AccountRotateAuthenticationKey {
-                from_scheme: bcs::from_bytes(script.args().get(0)?).ok()?,
+                from_scheme: bcs::from_bytes(script.args().first()?).ok()?,
                 from_public_key_bytes: bcs::from_bytes(script.args().get(1)?).ok()?,
                 to_scheme: bcs::from_bytes(script.args().get(2)?).ok()?,
                 to_public_key_bytes: bcs::from_bytes(script.args().get(3)?).ok()?,
@@ -2555,7 +2555,7 @@ mod decoder {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(
                 EntryFunctionCall::AccountRotateAuthenticationKeyWithRotationCapability {
-                    rotation_cap_offerer_address: bcs::from_bytes(script.args().get(0)?).ok()?,
+                    rotation_cap_offerer_address: bcs::from_bytes(script.args().first()?).ok()?,
                     new_scheme: bcs::from_bytes(script.args().get(1)?).ok()?,
                     new_public_key_bytes: bcs::from_bytes(script.args().get(2)?).ok()?,
                     cap_update_table: bcs::from_bytes(script.args().get(3)?).ok()?,
@@ -2569,7 +2569,7 @@ mod decoder {
     pub fn burn_set_send_community(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::BurnSetSendCommunity {
-                community: bcs::from_bytes(script.args().get(0)?).ok()?,
+                community: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -2579,7 +2579,7 @@ mod decoder {
     pub fn code_publish_package_txn(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::CodePublishPackageTxn {
-                metadata_serialized: bcs::from_bytes(script.args().get(0)?).ok()?,
+                metadata_serialized: bcs::from_bytes(script.args().first()?).ok()?,
                 code: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -2590,8 +2590,8 @@ mod decoder {
     pub fn coin_transfer(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::CoinTransfer {
-                coin_type: script.ty_args().get(0)?.clone(),
-                to: bcs::from_bytes(script.args().get(0)?).ok()?,
+                coin_type: script.ty_args().first()?.clone(),
+                to: bcs::from_bytes(script.args().first()?).ok()?,
                 amount: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -2605,7 +2605,7 @@ mod decoder {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(
                 EntryFunctionCall::CommunityWalletInitChangeSignerCommunityMultisig {
-                    multisig_address: bcs::from_bytes(script.args().get(0)?).ok()?,
+                    multisig_address: bcs::from_bytes(script.args().first()?).ok()?,
                     new_signer: bcs::from_bytes(script.args().get(1)?).ok()?,
                     is_add_operation: bcs::from_bytes(script.args().get(2)?).ok()?,
                     n_of_m: bcs::from_bytes(script.args().get(3)?).ok()?,
@@ -2622,7 +2622,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::CommunityWalletInitFinalizeAndCage {
-                num_signers: bcs::from_bytes(script.args().get(0)?).ok()?,
+                num_signers: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -2634,7 +2634,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::CommunityWalletInitInitCommunity {
-                initial_authorities: bcs::from_bytes(script.args().get(0)?).ok()?,
+                initial_authorities: bcs::from_bytes(script.args().first()?).ok()?,
                 check_threshold: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -2647,7 +2647,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::CommunityWalletInitProposeOffer {
-                new_signers: bcs::from_bytes(script.args().get(0)?).ok()?,
+                new_signers: bcs::from_bytes(script.args().first()?).ok()?,
                 num_signers: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -2661,7 +2661,7 @@ mod decoder {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(
                 EntryFunctionCall::DiemGovernanceAddApprovedScriptHashScript {
-                    proposal_id: bcs::from_bytes(script.args().get(0)?).ok()?,
+                    proposal_id: bcs::from_bytes(script.args().first()?).ok()?,
                 },
             )
         } else {
@@ -2674,7 +2674,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::DiemGovernanceAssertCanResolve {
-                proposal_id: bcs::from_bytes(script.args().get(0)?).ok()?,
+                proposal_id: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -2686,7 +2686,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::DiemGovernanceCreateProposalV2 {
-                execution_hash: bcs::from_bytes(script.args().get(0)?).ok()?,
+                execution_hash: bcs::from_bytes(script.args().first()?).ok()?,
                 metadata_location: bcs::from_bytes(script.args().get(1)?).ok()?,
                 metadata_hash: bcs::from_bytes(script.args().get(2)?).ok()?,
                 is_multi_step_proposal: bcs::from_bytes(script.args().get(3)?).ok()?,
@@ -2701,7 +2701,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::DiemGovernanceOlCreateProposalV2 {
-                execution_hash: bcs::from_bytes(script.args().get(0)?).ok()?,
+                execution_hash: bcs::from_bytes(script.args().first()?).ok()?,
                 metadata_location: bcs::from_bytes(script.args().get(1)?).ok()?,
                 metadata_hash: bcs::from_bytes(script.args().get(2)?).ok()?,
                 is_multi_step_proposal: bcs::from_bytes(script.args().get(3)?).ok()?,
@@ -2714,7 +2714,7 @@ mod decoder {
     pub fn diem_governance_ol_vote(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::DiemGovernanceOlVote {
-                proposal_id: bcs::from_bytes(script.args().get(0)?).ok()?,
+                proposal_id: bcs::from_bytes(script.args().first()?).ok()?,
                 should_pass: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -2745,7 +2745,7 @@ mod decoder {
     pub fn diem_governance_vote(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::DiemGovernanceVote {
-                proposal_id: bcs::from_bytes(script.args().get(0)?).ok()?,
+                proposal_id: bcs::from_bytes(script.args().first()?).ok()?,
                 should_pass: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -2758,7 +2758,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::DonorVoiceTxsProposeLiquidateTx {
-                multisig_address: bcs::from_bytes(script.args().get(0)?).ok()?,
+                multisig_address: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -2770,7 +2770,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::DonorVoiceTxsProposePaymentTx {
-                multisig_address: bcs::from_bytes(script.args().get(0)?).ok()?,
+                multisig_address: bcs::from_bytes(script.args().first()?).ok()?,
                 payee: bcs::from_bytes(script.args().get(1)?).ok()?,
                 value: bcs::from_bytes(script.args().get(2)?).ok()?,
                 description: bcs::from_bytes(script.args().get(3)?).ok()?,
@@ -2785,7 +2785,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::DonorVoiceTxsProposeVetoTx {
-                multisig_address: bcs::from_bytes(script.args().get(0)?).ok()?,
+                multisig_address: bcs::from_bytes(script.args().first()?).ok()?,
                 id: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -2798,7 +2798,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::DonorVoiceTxsVoteLiquidationTx {
-                multisig_address: bcs::from_bytes(script.args().get(0)?).ok()?,
+                multisig_address: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -2808,7 +2808,7 @@ mod decoder {
     pub fn donor_voice_txs_vote_veto_tx(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::DonorVoiceTxsVoteVetoTx {
-                multisig_address: bcs::from_bytes(script.args().get(0)?).ok()?,
+                multisig_address: bcs::from_bytes(script.args().first()?).ok()?,
                 id: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -2829,7 +2829,7 @@ mod decoder {
     pub fn jail_unjail_by_voucher(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::JailUnjailByVoucher {
-                addr: bcs::from_bytes(script.args().get(0)?).ok()?,
+                addr: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -2851,7 +2851,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::LibraCoinDelegateMintCapability {
-                to: bcs::from_bytes(script.args().get(0)?).ok()?,
+                to: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -2861,7 +2861,7 @@ mod decoder {
     pub fn libra_coin_mint_to_impl(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::LibraCoinMintToImpl {
-                dst_addr: bcs::from_bytes(script.args().get(0)?).ok()?,
+                dst_addr: bcs::from_bytes(script.args().first()?).ok()?,
                 amount: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -2872,7 +2872,7 @@ mod decoder {
     pub fn multi_action_claim_offer(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultiActionClaimOffer {
-                multisig_address: bcs::from_bytes(script.args().get(0)?).ok()?,
+                multisig_address: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -2894,7 +2894,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultiActionMigrationMigrateOffer {
-                multisig_address: bcs::from_bytes(script.args().get(0)?).ok()?,
+                multisig_address: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -2904,7 +2904,7 @@ mod decoder {
     pub fn multisig_account_add_owner(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultisigAccountAddOwner {
-                new_owner: bcs::from_bytes(script.args().get(0)?).ok()?,
+                new_owner: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -2914,7 +2914,7 @@ mod decoder {
     pub fn multisig_account_add_owners(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultisigAccountAddOwners {
-                new_owners: bcs::from_bytes(script.args().get(0)?).ok()?,
+                new_owners: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -2926,7 +2926,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultisigAccountApproveTransaction {
-                multisig_account: bcs::from_bytes(script.args().get(0)?).ok()?,
+                multisig_account: bcs::from_bytes(script.args().first()?).ok()?,
                 sequence_number: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -2937,7 +2937,7 @@ mod decoder {
     pub fn multisig_account_create(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultisigAccountCreate {
-                num_signatures_required: bcs::from_bytes(script.args().get(0)?).ok()?,
+                num_signatures_required: bcs::from_bytes(script.args().first()?).ok()?,
                 metadata_keys: bcs::from_bytes(script.args().get(1)?).ok()?,
                 metadata_values: bcs::from_bytes(script.args().get(2)?).ok()?,
             })
@@ -2951,7 +2951,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultisigAccountCreateTransaction {
-                multisig_account: bcs::from_bytes(script.args().get(0)?).ok()?,
+                multisig_account: bcs::from_bytes(script.args().first()?).ok()?,
                 payload: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -2965,7 +2965,7 @@ mod decoder {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(
                 EntryFunctionCall::MultisigAccountCreateTransactionWithHash {
-                    multisig_account: bcs::from_bytes(script.args().get(0)?).ok()?,
+                    multisig_account: bcs::from_bytes(script.args().first()?).ok()?,
                     payload_hash: bcs::from_bytes(script.args().get(1)?).ok()?,
                 },
             )
@@ -2980,7 +2980,7 @@ mod decoder {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(
                 EntryFunctionCall::MultisigAccountCreateWithExistingAccount {
-                    multisig_address: bcs::from_bytes(script.args().get(0)?).ok()?,
+                    multisig_address: bcs::from_bytes(script.args().first()?).ok()?,
                     owners: bcs::from_bytes(script.args().get(1)?).ok()?,
                     num_signatures_required: bcs::from_bytes(script.args().get(2)?).ok()?,
                     account_scheme: bcs::from_bytes(script.args().get(3)?).ok()?,
@@ -3001,7 +3001,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultisigAccountCreateWithOwners {
-                additional_owners: bcs::from_bytes(script.args().get(0)?).ok()?,
+                additional_owners: bcs::from_bytes(script.args().first()?).ok()?,
                 num_signatures_required: bcs::from_bytes(script.args().get(1)?).ok()?,
                 metadata_keys: bcs::from_bytes(script.args().get(2)?).ok()?,
                 metadata_values: bcs::from_bytes(script.args().get(3)?).ok()?,
@@ -3017,7 +3017,7 @@ mod decoder {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(
                 EntryFunctionCall::MultisigAccountExecuteRejectedTransaction {
-                    multisig_account: bcs::from_bytes(script.args().get(0)?).ok()?,
+                    multisig_account: bcs::from_bytes(script.args().first()?).ok()?,
                 },
             )
         } else {
@@ -3030,7 +3030,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultisigAccountMigrateWithOwners {
-                additional_owners: bcs::from_bytes(script.args().get(0)?).ok()?,
+                additional_owners: bcs::from_bytes(script.args().first()?).ok()?,
                 num_signatures_required: bcs::from_bytes(script.args().get(1)?).ok()?,
                 metadata_keys: bcs::from_bytes(script.args().get(2)?).ok()?,
                 metadata_values: bcs::from_bytes(script.args().get(3)?).ok()?,
@@ -3045,7 +3045,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultisigAccountRejectTransaction {
-                multisig_account: bcs::from_bytes(script.args().get(0)?).ok()?,
+                multisig_account: bcs::from_bytes(script.args().first()?).ok()?,
                 sequence_number: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -3058,7 +3058,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultisigAccountRemoveOwner {
-                owner_to_remove: bcs::from_bytes(script.args().get(0)?).ok()?,
+                owner_to_remove: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -3070,7 +3070,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultisigAccountRemoveOwners {
-                owners_to_remove: bcs::from_bytes(script.args().get(0)?).ok()?,
+                owners_to_remove: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -3082,7 +3082,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultisigAccountUpdateMetadata {
-                keys: bcs::from_bytes(script.args().get(0)?).ok()?,
+                keys: bcs::from_bytes(script.args().first()?).ok()?,
                 values: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -3095,7 +3095,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultisigAccountUpdateSignaturesRequired {
-                new_num_signatures_required: bcs::from_bytes(script.args().get(0)?).ok()?,
+                new_num_signatures_required: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -3107,7 +3107,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::MultisigAccountVoteTransanction {
-                multisig_account: bcs::from_bytes(script.args().get(0)?).ok()?,
+                multisig_account: bcs::from_bytes(script.args().first()?).ok()?,
                 sequence_number: bcs::from_bytes(script.args().get(1)?).ok()?,
                 approved: bcs::from_bytes(script.args().get(2)?).ok()?,
             })
@@ -3119,7 +3119,7 @@ mod decoder {
     pub fn object_transfer_call(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::ObjectTransferCall {
-                object: bcs::from_bytes(script.args().get(0)?).ok()?,
+                object: bcs::from_bytes(script.args().first()?).ok()?,
                 to: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -3130,7 +3130,7 @@ mod decoder {
     pub fn ol_account_create_account(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::OlAccountCreateAccount {
-                auth_key: bcs::from_bytes(script.args().get(0)?).ok()?,
+                auth_key: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -3142,7 +3142,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::OlAccountSetAllowDirectCoinTransfers {
-                allow: bcs::from_bytes(script.args().get(0)?).ok()?,
+                allow: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -3152,7 +3152,7 @@ mod decoder {
     pub fn ol_account_transfer(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::OlAccountTransfer {
-                to: bcs::from_bytes(script.args().get(0)?).ok()?,
+                to: bcs::from_bytes(script.args().first()?).ok()?,
                 amount: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -3179,7 +3179,7 @@ mod decoder {
     pub fn proof_of_fee_pof_update_bid(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::ProofOfFeePofUpdateBid {
-                bid: bcs::from_bytes(script.args().get(0)?).ok()?,
+                bid: bcs::from_bytes(script.args().first()?).ok()?,
                 epoch_expiry: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -3192,7 +3192,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::ProofOfFeePofUpdateBidNetReward {
-                net_reward: bcs::from_bytes(script.args().get(0)?).ok()?,
+                net_reward: bcs::from_bytes(script.args().first()?).ok()?,
                 epoch_expiry: bcs::from_bytes(script.args().get(1)?).ok()?,
             })
         } else {
@@ -3203,7 +3203,7 @@ mod decoder {
     pub fn safe_init_payment_multisig(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::SafeInitPaymentMultisig {
-                authorities: bcs::from_bytes(script.args().get(0)?).ok()?,
+                authorities: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -3213,7 +3213,7 @@ mod decoder {
     pub fn secret_bid_commit(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::SecretBidCommit {
-                digest: bcs::from_bytes(script.args().get(0)?).ok()?,
+                digest: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -3223,7 +3223,7 @@ mod decoder {
     pub fn secret_bid_reveal(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::SecretBidReveal {
-                pk: bcs::from_bytes(script.args().get(0)?).ok()?,
+                pk: bcs::from_bytes(script.args().first()?).ok()?,
                 net_reward: bcs::from_bytes(script.args().get(1)?).ok()?,
                 signed_msg: bcs::from_bytes(script.args().get(2)?).ok()?,
             })
@@ -3237,7 +3237,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::SlowWalletSmokeTestVmUnlock {
-                user_addr: bcs::from_bytes(script.args().get(0)?).ok()?,
+                user_addr: bcs::from_bytes(script.args().first()?).ok()?,
                 unlocked: bcs::from_bytes(script.args().get(1)?).ok()?,
                 transferred: bcs::from_bytes(script.args().get(2)?).ok()?,
             })
@@ -3257,7 +3257,7 @@ mod decoder {
     pub fn stake_initialize_validator(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::StakeInitializeValidator {
-                consensus_pubkey: bcs::from_bytes(script.args().get(0)?).ok()?,
+                consensus_pubkey: bcs::from_bytes(script.args().first()?).ok()?,
                 proof_of_possession: bcs::from_bytes(script.args().get(1)?).ok()?,
                 network_addresses: bcs::from_bytes(script.args().get(2)?).ok()?,
                 fullnode_addresses: bcs::from_bytes(script.args().get(3)?).ok()?,
@@ -3270,7 +3270,7 @@ mod decoder {
     pub fn stake_rotate_consensus_key(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::StakeRotateConsensusKey {
-                validator_address: bcs::from_bytes(script.args().get(0)?).ok()?,
+                validator_address: bcs::from_bytes(script.args().first()?).ok()?,
                 new_consensus_pubkey: bcs::from_bytes(script.args().get(1)?).ok()?,
                 proof_of_possession: bcs::from_bytes(script.args().get(2)?).ok()?,
             })
@@ -3284,7 +3284,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::StakeUpdateNetworkAndFullnodeAddresses {
-                validator_address: bcs::from_bytes(script.args().get(0)?).ok()?,
+                validator_address: bcs::from_bytes(script.args().first()?).ok()?,
                 new_network_addresses: bcs::from_bytes(script.args().get(1)?).ok()?,
                 new_fullnode_addresses: bcs::from_bytes(script.args().get(2)?).ok()?,
             })
@@ -3298,7 +3298,7 @@ mod decoder {
     ) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::ValidatorUniverseRegisterValidator {
-                consensus_pubkey: bcs::from_bytes(script.args().get(0)?).ok()?,
+                consensus_pubkey: bcs::from_bytes(script.args().first()?).ok()?,
                 proof_of_possession: bcs::from_bytes(script.args().get(1)?).ok()?,
                 network_addresses: bcs::from_bytes(script.args().get(2)?).ok()?,
                 fullnode_addresses: bcs::from_bytes(script.args().get(3)?).ok()?,
@@ -3311,7 +3311,7 @@ mod decoder {
     pub fn version_set_version(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::VersionSetVersion {
-                major: bcs::from_bytes(script.args().get(0)?).ok()?,
+                major: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -3321,7 +3321,7 @@ mod decoder {
     pub fn vouch_insist_vouch_for(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::VouchInsistVouchFor {
-                friend_account: bcs::from_bytes(script.args().get(0)?).ok()?,
+                friend_account: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -3331,7 +3331,7 @@ mod decoder {
     pub fn vouch_revoke(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::VouchRevoke {
-                friend_account: bcs::from_bytes(script.args().get(0)?).ok()?,
+                friend_account: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
@@ -3341,7 +3341,7 @@ mod decoder {
     pub fn vouch_vouch_for(payload: &TransactionPayload) -> Option<EntryFunctionCall> {
         if let TransactionPayload::EntryFunction(script) = payload {
             Some(EntryFunctionCall::VouchVouchFor {
-                friend_account: bcs::from_bytes(script.args().get(0)?).ok()?,
+                friend_account: bcs::from_bytes(script.args().first()?).ok()?,
             })
         } else {
             None
diff --git a/tools/txs/src/stream/epoch_tickle_poll.rs b/tools/txs/src/stream/epoch_tickle_poll.rs
index 35e2599f2..a9aed19ef 100644
--- a/tools/txs/src/stream/epoch_tickle_poll.rs
+++ b/tools/txs/src/stream/epoch_tickle_poll.rs
@@ -33,7 +33,6 @@ pub fn epoch_tickle_poll(mut tx: Sender<TransactionPayload>, client: Client) {
         }
 
         thread::sleep(Duration::from_millis(60000));
-
     });
     handle.join().expect("cannot poll for epoch boundary");
 }
diff --git a/tools/txs/src/submit_transaction.rs b/tools/txs/src/submit_transaction.rs
index b0736ce34..1651e1dac 100644
--- a/tools/txs/src/submit_transaction.rs
+++ b/tools/txs/src/submit_transaction.rs
@@ -228,7 +228,7 @@ impl Sender {
             .unwrap();
 
         // Call the asynchronous connect method using the runtime.
-        Ok(rt.block_on(self.sign_submit_wait(payload))?)
+        rt.block_on(self.sign_submit_wait(payload))
     }
 
     /// Signs a transaction payload.
diff --git a/tools/txs/src/txs_cli_stream.rs b/tools/txs/src/txs_cli_stream.rs
index 1003ba54c..2ba9d4752 100644
--- a/tools/txs/src/txs_cli_stream.rs
+++ b/tools/txs/src/txs_cli_stream.rs
@@ -1,6 +1,6 @@
 // use crate::bid_commit_reveal::PofBidArgs;
-use crate::submit_transaction::Sender as LibraSender;
 use crate::stream::epoch_tickle_poll::epoch_tickle_poll;
+use crate::submit_transaction::Sender as LibraSender;
 use diem_logger::prelude::{error, info};
 use diem_types::transaction::TransactionPayload;
 use std::process::exit;
@@ -24,11 +24,11 @@ impl StreamTxs {
 
         match &self {
             StreamTxs::EpochTickle => {
-              epoch_tickle_poll(tx, client);
-            },
+                epoch_tickle_poll(tx, client);
+            }
             _ => {
-              println!("no service specified");
-              exit(1);
+                println!("no service specified");
+                exit(1);
             }
         };
 
@@ -46,7 +46,8 @@ pub(crate) fn listen(
     rx: Receiver<TransactionPayload>,
     send: Arc<Mutex<LibraSender>>,
 ) -> JoinHandle<()> {
-    let worker = thread::spawn(move || {
+    
+    thread::spawn(move || {
         let mut busy = false;
 
         while !busy {
@@ -74,6 +75,5 @@ pub(crate) fn listen(
                 Err(_) => break,
             };
         }
-    });
-    worker
+    })
 }
diff --git a/tools/txs/src/txs_cli_vals.rs b/tools/txs/src/txs_cli_vals.rs
index d12ec7f1c..bfd34ce70 100644
--- a/tools/txs/src/txs_cli_vals.rs
+++ b/tools/txs/src/txs_cli_vals.rs
@@ -79,25 +79,23 @@ impl ValidatorTxs {
             } => {
                 if *retract {
                     ProofOfFeePofRetractBid {}
+                } else if let Some(b) = bid_pct {
+                    // TODO: the u64 will truncate, but without rounding it will drop the last digit.
+                    let scaled_bid = (b * 1000.0).round() as u64; // scale to 10ˆ3.
+                    if scaled_bid > 1100 {
+                        bail!(
+                        "a bid amount at 110.0% or above the epoch's reward, will be rejected"
+                    );
+                    }
+                    ProofOfFeePofUpdateBid {
+                        bid: scaled_bid,
+                        epoch_expiry: *expiry,
+                    }
                 } else {
-                    if let Some(b) = bid_pct {
-                        // TODO: the u64 will truncate, but without rounding it will drop the last digit.
-                        let scaled_bid = (b * 1000.0).round() as u64; // scale to 10ˆ3.
-                        if scaled_bid > 1100 {
-                            bail!(
-                            "a bid amount at 110.0% or above the epoch's reward, will be rejected"
-                        );
-                        }
-                        ProofOfFeePofUpdateBid {
-                            bid: scaled_bid,
-                            epoch_expiry: *expiry,
-                        }
-                    } else {
-                        // Default path is to update based on the expected net reward
-                        ProofOfFeePofUpdateBidNetReward {
-                            net_reward: *net_reward,
-                            epoch_expiry: *expiry,
-                        }
+                    // Default path is to update based on the expected net reward
+                    ProofOfFeePofUpdateBidNetReward {
+                        net_reward: *net_reward,
+                        epoch_expiry: *expiry,
                     }
                 }
             }