From 7e934f3db5b98a9b2f6f3c6152cad8f63c9a4d1a Mon Sep 17 00:00:00 2001
From: JonasIsensee <jonas.isensee@web.de>
Date: Tue, 19 Dec 2023 11:26:45 +0100
Subject: [PATCH] bignum fix (#513)

Co-authored-by: Jonas Isensee <jonas.isensee@ds.mpg.de>
---
 src/data/specialcased_types.jl | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/data/specialcased_types.jl b/src/data/specialcased_types.jl
index 5c08646c..d0fc5215 100644
--- a/src/data/specialcased_types.jl
+++ b/src/data/specialcased_types.jl
@@ -180,6 +180,13 @@ wconvert(::Type{String}, x::BigFloat) = string(x)
 rconvert(::Type{BigInt}, x::String) = parse(BigInt, x, base = 62)
 rconvert(::Type{BigFloat}, x::String) = parse(BigFloat, x)
 
+# BigInts and BigFloats are defined as mutable structs but should be reconstructed like an
+# immutable one. This overrides the default behavior.
+function jlconvert(::ReadRepresentation{BN,CustomSerialization{String,Vlen{String}}},
+        f::JLDFile, ptr::Ptr, header_offset::RelOffset) where BN <: Union{BigInt, BigFloat}
+    rconvert(BN, jlconvert(ReadRepresentation{String, Vlen{String}}(), f, ptr, header_offset))
+end
+
 ## Pointers
 
 # Previously it was disallowed to serialize pointers.