tests: Fix BigInt tests on 32-bit
Since we test BigInt values for each type that has a key in the BigIntLimits object, we need to not define keys for types that are not 64-bits.
Closes: #462 (closed)
Since we test BigInt values for each type that has a key in the BigIntLimits object, we need to not define keys for types that are not 64-bits.
Closes: #462 (closed)