Feature
* feat: add require functions to top-level namespace ([`427c80a`](https://github.com/kalekundert/multipartial/commit/427c80a47aae4649ae5484c3575bddd2f2c33f19))
* feat: support negative indices ([`f74e913`](https://github.com/kalekundert/multipartial/commit/f74e913f093ca25600e964f4dfa9f4cf8b4364a7))