Can folly parse unsigned int numbers?

The json I am parsing on the parser, gives overflow error as it cannot parse 2^64 numbers. It can only parse till 2^63. How to deal with large numbers?

Start by locating folly's JSON parser and the numeric overflow handling, then reproduce the issue with an unsigned 2^64 value. Done means establishing whether unsigned 64-bit values are supported and either fixing the parser behavior or clearly documenting the supported range.

Written by the indexing model from the issue text.