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Description
When implementing #75 in V8 I was wondering that the IndexValueToU64 algorithm throws a TypeError if the value is not a BigInt, instead of using the ToBigInt64 algorithm that's also used in ToWebAssemblyValue.
Any reason for this restriction, or should we be consistent there and accept anything that converts to a BigInt64 according to that algorithm (in particular boolean values and string, but notably not Numbers).
One difficulty with switching to ToBigInt64 would be static typing on the IndexValue type. Instead of unsigned long or bigint this would need to be unsigned long or object I guess.