Variable JSONIntConst

Remarks

• Based on Crockford's JSON reference parser approach (recursive descent), adapted for BigInt.
• Does not touch the global JSON object.
• Stringifies BigInt as pure JSON numbers (no quotes, no n).

Gotchas.

• s === JSONInt.stringify(JSONInt.parse(s)) is generally true for canonical JSON inputs.

• o !== JSONInt.parse(JSONInt.stringify(o)) can happen because:

  • BigInt is stringified as an unquoted JSON number token (loss of JS type on parse).
  • undefined values are dropped or become null in arrays, per JSON rules.
  • Custom toJSON/replacer behavior can change output.

There is no consistent way to preserve BigInt type through JSON today, so handling that case is up to users. In Cashu-TS, we use the Amount VO to normalize numbers.