`toPaths` and `defaultValue` cause mutations to original schema, ignores `z.clone()`

[wms]

toPaths and defaultValue seem to have some weird interaction in that running them on the same schema causes a change in the output, even if I use z.clone() before applying either operation.

Although I'm only using these functions, there may be other interactions I've not uncovered.

Reproduction.

[wms]

I kept on banging at this and realized its due to the 'seen' WeakMap being reused across all fold usage. As an obscene workaround, I was able to forcibly reset this between invocations:

const resetFunctor = () =>
  fold((_, idx) => {
    Object.assign(idx, {
      seen: new WeakMap(),
    });
  })(z.void());