feat: match args leniently according to spec signature

[mcous]

Closes #78

[codecov]

Codecov Report

Merging #89 (66da4a5) into main (be6c780) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
+ Coverage   97.67%   97.71%   +0.03%     
==========================================
  Files          17       17              
  Lines         516      525       +9     
  Branches       95       96       +1     
==========================================
+ Hits          504      513       +9     
  Misses         10       10              
  Partials        2        2              

Impacted Files	Coverage Δ
decoy/spy.py	100.00% <100.00%> (ø)
decoy/warnings.py	100.00% <100.00%> (ø)

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