1bffffffffffffffff does not round-trip #3
Description
1bffffffffffffffff has to turn into a BigInteger in JavaScript when decoded. When re-encoded, that turns into c248ffffffffffffffff:
c2 -- Tag #2
48 -- Bytes, length: 8
ffffffffffffffff -- ffffffffffffffff
If I special-case the encoding for BigIntegers that fit into 8 byte normal integers, then c248ffffffffffffffff won't round-trip. My suggestion is to just set roundtrip to false for this case.