([Full Changelog](https://github.com/ipython/traitlets/compare/v5.9.0...6588680dc69be75676ca3835b4061b1784232600))
Enhancements made
- Added type hints to HasTraits.observe() and friends. (834 [834](https://github.com/ipython/traitlets/pull/834) ([scholer](https://github.com/scholer))
- feat: trait typing [818](https://github.com/ipython/traitlets/pull/818) ([maartenbreddels](https://github.com/maartenbreddels))
Maintenance and upkeep improvements
- Fix mypy deps and support Python 3.8-3.12 [862](https://github.com/ipython/traitlets/pull/862) ([blink1073](https://github.com/blink1073))
- Update pytest requirement from \<7.2,>=7.0 to >=7.0,\<7.5 [861](https://github.com/ipython/traitlets/pull/861) ([dependabot](https://github.com/dependabot))
- Bump actions/checkout from 3 to 4 [860](https://github.com/ipython/traitlets/pull/860) ([dependabot](https://github.com/dependabot))
- Fix typing [848](https://github.com/ipython/traitlets/pull/848) ([blink1073](https://github.com/blink1073))
- Update docs config [843](https://github.com/ipython/traitlets/pull/843) ([blink1073](https://github.com/blink1073))
- Use local coverage [842](https://github.com/ipython/traitlets/pull/842) ([blink1073](https://github.com/blink1073))
- Adjust argcomplete typings [839](https://github.com/ipython/traitlets/pull/839) ([blink1073](https://github.com/blink1073))
- Better warnings [838](https://github.com/ipython/traitlets/pull/838) ([NickCrews](https://github.com/NickCrews))
- Update typings (836 [836](https://github.com/ipython/traitlets/pull/836) ([blink1073](https://github.com/blink1073))
Documentation improvements
- rename `MyClass` to `School` [858](https://github.com/ipython/traitlets/pull/858) ([metaperl](https://github.com/metaperl))
- Even though returning a value from a validation method is ideal, by no means is `proposal['value']` the only thing that can be returned [855](https://github.com/ipython/traitlets/pull/855) ([metaperl](https://github.com/metaperl))
- Document help parameter of TraitType.__init__(). [847](https://github.com/ipython/traitlets/pull/847) ([metaperl](https://github.com/metaperl))
Other merged PRs
- Clean up license (832)Co-authored-by: pre-commit-ci\[bot\] \<66853113+pre-commit-ci\[bot\]users.noreply.github.com> [832](https://github.com/ipython/traitlets/pull/832) ([dcsaba89](https://github.com/dcsaba89))
Contributors to this release
([GitHub contributors page for this release](https://github.com/ipython/traitlets/graphs/contributors?from=2023-01-30&to=2023-09-14&type=c))
[blink1073](https://github.com/search?q=repo%3Aipython%2Ftraitlets+involves%3Ablink1073+updated%3A2023-01-30..2023-09-14&type=Issues) | [dcsaba89](https://github.com/search?q=repo%3Aipython%2Ftraitlets+involves%3Adcsaba89+updated%3A2023-01-30..2023-09-14&type=Issues) | [dependabot](https://github.com/search?q=repo%3Aipython%2Ftraitlets+involves%3Adependabot+updated%3A2023-01-30..2023-09-14&type=Issues) | [maartenbreddels](https://github.com/search?q=repo%3Aipython%2Ftraitlets+involves%3Amaartenbreddels+updated%3A2023-01-30..2023-09-14&type=Issues) | [metaperl](https://github.com/search?q=repo%3Aipython%2Ftraitlets+involves%3Ametaperl+updated%3A2023-01-30..2023-09-14&type=Issues) | [NickCrews](https://github.com/search?q=repo%3Aipython%2Ftraitlets+involves%3ANickCrews+updated%3A2023-01-30..2023-09-14&type=Issues) | [pre-commit-ci](https://github.com/search?q=repo%3Aipython%2Ftraitlets+involves%3Apre-commit-ci+updated%3A2023-01-30..2023-09-14&type=Issues) | [rmorshea](https://github.com/search?q=repo%3Aipython%2Ftraitlets+involves%3Armorshea+updated%3A2023-01-30..2023-09-14&type=Issues) | [saulshanabrook](https://github.com/search?q=repo%3Aipython%2Ftraitlets+involves%3Asaulshanabrook+updated%3A2023-01-30..2023-09-14&type=Issues) | [scholer](https://github.com/search?q=repo%3Aipython%2Ftraitlets+involves%3Ascholer+updated%3A2023-01-30..2023-09-14&type=Issues)