Function redefine_static_methods 

pub fn redefine_static_methods(ctx: &Ctx<'_>) -> Result<()>

Replace JSON.parse / JSON.stringify with this module’s.

NOT called by crate::init, and not ready to be. It is about a third faster than the engine’s both ways, but measured against Node it still differs in ways that matter:

• parse assigns keys through [[Set]], so {"__proto__": {...}} retargets the result’s prototype rather than becoming an own property. For a runtime that parses untrusted JSON that is a prototype-pollution primitive, and it is the reason this is off.
• parse ignores its reviver argument entirely.
• stringify writes a hole or an undefined array element as nothing rather than null, which emits invalid JSON ([1,,2]).
• stringify does not unwrap boxed primitives: new Number(5) serialises as {} where the spec says 5.
• stringify writes -0 for negative zero (spec: 0) and 1e21 where the spec’s ToString gives 1e+21.

crates/ferrijs/tests/json_conformance.rs is the set these came from; make it pass before turning this on.