Added a 0.4.1 section

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Justin Ethier 2017-03-16 21:35:05 +00:00
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# Changelog
## TBD (Tenatively 0.4.1)
Features
- Store parameter objects in such a way that changes to a parameter object do not affect other threads that use the same parameter object.
The specific requirement from R<sup>7</sup>RS is:
> `parameterize` must not change the associated values of any parameters in any thread other than the current thread and threads created inside the `parameterize` body.
- Normalize the result of `string->number` such that bignums are only returned if the result truly is a bignum.
Bug Fixes
- Prevent exception handlers from being accidentally collected when the collector cooperates on behalf of a mutator.
- Fixed a regression where `string->number` returns `0` on bad input instead of `#f`.
## 0.4 - March 9, 2017
- Added a new bignum type to support exact integers of practically unlimited size.