## Unreleased
  - Fixes stringify to only take ancestors into account when checking
    circularity.  
    It previously assumed every visited object was circular which led to [false
    positives][issue9].  
    Uses the tiny serializer I wrote for [Must.js][must] a year and a half ago.
  - Fixes calling the `replacer` function in the proper context (`thisArg`).
  - Fixes calling the `cycleReplacer` function in the proper context (`thisArg`).
  - Speeds serializing by a factor of
    Big-O(h-my-god-it-linearly-searched-every-object) it had ever seen. Searching
    only the ancestors for a circular references speeds up things considerably.
  
  [must]: https://github.com/moll/js-must
  [issue9]: https://github.com/isaacs/json-stringify-safe/issues/9