Extended BorrowDecode for HashMap to support custom hashers

[Speedy37]

No description provided.

[codecov]

Codecov Report

Base: 54.21% // Head: 54.19% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (c716186) compared to base (52464e0).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk     #585      +/-   ##
==========================================
- Coverage   54.21%   54.19%   -0.02%     
==========================================
  Files          50       50              
  Lines        4429     4430       +1     
==========================================
  Hits         2401     2401              
- Misses       2028     2029       +1     

Impacted Files	Coverage Δ
src/features/impl_std.rs	66.01% <0.00%> (-0.33%)	⬇️

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[VictorKoenders]

I really need to get better at catching this myself.

Thanks for the PR!