Collections support

[Mogost]

Fix #574

@sebastianmanger @lpomfrey This PR should address your problem from #574, could you please review/test it?

cc: @ivan-klass @Natim @camilonova

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 85.41%. Comparing base (ef24fcb) to head (6f95cbe).
Report is 32 commits behind head on master.

Files with missing lines	Patch %	Lines
constance/codecs.py	50.00%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #581      +/-   ##
==========================================
- Coverage   89.92%   85.41%   -4.51%     
==========================================
  Files          31       21      -10     
  Lines        1032      727     -305     
  Branches      104      130      +26     
==========================================
- Hits          928      621     -307     
- Misses         69       71       +2     
  Partials       35       35              

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[lpomfrey]

We've done some testing and this would seem to fix our problems from #574 👍

[camilonova]

Looks good to me

[Mogost]

There's a lack of documentation. If anyone has time to help with it, I would be glad!

[sebastianmanger]

Thanks a lot! This fully supports my use cases.
As a pure user of the library, I personally would expect something minimal like sebastianmanger@7c24c6d

[Mogost]

Thanks a lot! This fully supports my use cases. As a pure user of the library, I personally would expect something minimal like sebastianmanger@7c24c6d

Thank you. cherry-picked

[Mogost]

Tagged with 4.1.0 version. Should be released soon