Use functools.singledispatchmethod for __contains__

[gerlero]

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[codecov]

Codecov Report

Attention: Patch coverage is 84.61538% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 89.07%. Comparing base (5e2d6bf) to head (bb75c82).

❗ Current head bb75c82 differs from pull request most recent head 576fa01. Consider uploading reports for the commit 576fa01 to get more accurate results

Files	Patch %	Lines
electrolytes/__init__.py	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
+ Coverage   88.96%   89.07%   +0.10%     
==========================================
  Files           2        2              
  Lines         299      302       +3     
==========================================
+ Hits          266      269       +3     
  Misses         33       33              

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