Verify validity of curve points constructed with explicit coordinates #90
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Deploying p256k1 with
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…pose secp256k1_ge_is_valid_var via Point::is_valid
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When constructing curve points from explicit
xandycoordinates, it is possible to end up with a point which is not on thesecp256k1curve. This PR replaces the relevantimpl Fromwithimpl TryFromand checks the validity of the resulting point.Closes #88
Closes #89