twisted.spread.jelly.unjelly breaks on classes defining __slots__

[toidinamai]

twisted.spread.jelly.unjelly breaks on classes that do not have a __dict__ attribute and define their own __setstate__ and __getstate__ methods for serialization. An example of those classes are those defining __slots__.

[toidinamai]

new test case

[toidinamai]

implementation for the new test case

[exarkun]

(In [28928]) Branching to 'jelly-slots-4430'

[exarkun]

(In [28929]) Apply toidinamai's patch

refs #4430

[exarkun]

Thanks for the patch. A few simple things:

1. NO_STATE should probably be private
2. Operators should have whitespace on both sides.
3. The docs for the state parameter to _newInstance should be updated.
4. Methods should be separated from each other by two blank lines.
5. Everything should have a docstring (particularly test methods)
6. Copyright date on modified files should be updated
7. There should be a news fragment describing the change

Nothing controversial here, so I'll make the changes and apply the patch. Thanks again!

[exarkun]

(In [28937]) Merge jelly-slots-4430

Author: toidinamai Reviewer: exarkun Fixes: #4430

Support jellying and unjellying objects with no __dict__ but which do implement __getstate__ and __setstate__.