Bring back PyQt bound signal equality work around

[altendky]

Draft for:

• Decide if you really want to be doing back-compat at this point

[codecov]

Codecov Report

Merging #190 (676fdd0) into main (bdbd026) will decrease coverage by 0.09%.
The diff coverage is 60.00%.

@@             Coverage Diff             @@
##              main     #190      +/-   ##
===========================================
- Coverage   100.00%   99.90%   -0.10%     
===========================================
  Files           35       35              
  Lines         2023     2028       +5     
  Branches       138      141       +3     
===========================================
+ Hits          2023     2026       +3     
- Misses           0        1       +1     
- Partials         0        1       +1     

Impacted Files	Coverage Δ
qtrio/_core.py	99.08% <60.00%> (-0.92%)	⬇️

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