450 kwonly before init false

[gabbard]

Pull Request Check List

This is just a reminder about the most common mistakes. Please make sure that you tick all appropriate boxes. But please read our contribution guide at least once, it will save you unnecessary review cycles!

If an item doesn't apply to your pull request, check it anyway to make it apparent that there's nothing to do.

• [ X] Added tests for changed code.
• [ X] New features have been added to our Hypothesis testing strategy. (Wasn't obvious what to add, if anything)
• [X ] Changes or additions to public APIs are reflected in our type stubs (files ending in .pyi).
  • [X ] ...and used in the stub test file tests/typing_example.py. No changes to public APIs
• [ X] Updated documentation for changed code. n/a
  • [ X] New functions/classes have to be added to docs/api.rst by hand.
  • [ X] Changes to the signature of @attr.s() have to be added by hand too.
  • [ X] Changed/added classes/methods/functions have appropriate versionadded, versionchanged, or deprecated directives.
• [ X] Documentation in .rst files is written using semantic newlines. no docs added
• [X ] Changes (and possible deprecations) have news fragments in changelog.d.

If you have any questions to any of the points above, just submit and ask! This checklist is here to help you, not to deter you from contributing!

[hynek]

I’m at a conference so I can’t review in depths. It looks good overall, but could you make sure that attr.ib(init=False, default=42) works too?

[gabbard]

@hynek : thanks - I've added the requested test

[hynek]

There’s a bit of minor stuff (changeling is not markdown;)) but I made you wait long enough, I’m very sorry!