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Changelog for 1.13 #18000

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43 changes: 43 additions & 0 deletions CHANGELOG.md
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## Next release

## Mypy 1.13

We’ve just uploaded mypy 1.13 to the Python Package Index ([PyPI](https://pypi.org/project/mypy/)).
Mypy is a static type checker for Python. You can install it as follows:

python3 -m pip install -U mypy

You can read the full documentation for this release on [Read the Docs](http://mypy.readthedocs.io).

Note that unlike typical releases, Mypy 1.13 does not have any changes to type checking semantics
from 1.12.1.

### Improved performance

Mypy 1.13 contains several performance improvements. Users can expect mypy to be 5-20% faster.
In environments with long search paths (such as environments using many editable installs), mypy
can be significantly faster, e.g. 2.2x faster in the use case targeted by these improvements.

Mypy 1.13 allows use of the `orjson` library for handling the cache instead of the stdlib `json`,
for improved performance. You can ensure the presence of `orjson` using the `faster-cache` extra:
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are there any stats for this? Any downsides? What's the comparison with sqlite?

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Depends on your workload and whether incremental or not, Jukka measured 10-15% in #17955 (comment) , I've seen the lower end of that

It composes with sqlite, since mypy's sqlite thing just dumps json into sqlite. I think sqlite cache is mainly a way to workaround filesystem performance. I haven't benchmarked (or really used) the sqlite option. Jukka mentions he'd like to make it the default in the future though: #17955 (comment)


python3 -m pip install -U mypy[faster-cache]

Mypy may depend on `orjson` by default in the future.

These improvements were contributed by Shantanu.

List of changes:
* Significantly speed up file handling error paths (Shantanu, PR [17920](https://github.com/python/mypy/pull/17920))
* Use fast path in modulefinder more often (Shantanu, PR [17950](https://github.com/python/mypy/pull/17950))
* Let mypyc optimise os.path.join (Shantanu, PR [17949](https://github.com/python/mypy/pull/17949))
* Make is_sub_path faster (Shantanu, PR [17962](https://github.com/python/mypy/pull/17962))
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Minor: don't mention is_sub_path in the changelog. since it refers to an internal implementation detail.

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I'll keep the mention... I think all of these changes are basically internal implementation details (it would be worrisome if they were not ;-) )

The specific is_sub_path change is both one of the bigger perf wins and one of the riskier changes in this series (since the behaviour of is_sub_path is different)

* Speed up stubs suggestions (Shantanu, PR [17965](https://github.com/python/mypy/pull/17965))
* Use sha1 for hashing (Shantanu, PR [17953](https://github.com/python/mypy/pull/17953))
* Use orjson instead of json, when available (Shantanu, PR [17955](https://github.com/python/mypy/pull/17955))
* Add faster-cache extra, test in CI (Shantanu, PR [17978](https://github.com/python/mypy/pull/17978))

### Acknowledgements
Thanks to all mypy contributors who contributed to this release:

- Shantanu Jain
- Jukka Lehtosalo

## Mypy 1.12

We’ve just uploaded mypy 1.12 to the Python Package Index ([PyPI](https://pypi.org/project/mypy/)). Mypy is a static type
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