fix: use explicit key mapping for flow keys

[tdakkota]

Fixes #60.

[codecov]

Codecov Report

Patch coverage: 89.47% and project coverage change: +0.09 🎉

Comparison is base (c6b72e5) 77.52% compared to head (03d700e) 77.61%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
+ Coverage   77.52%   77.61%   +0.09%     
==========================================
  Files          22       22              
  Lines        7274     7292      +18     
==========================================
+ Hits         5639     5660      +21     
+ Misses       1261     1255       -6     
- Partials      374      377       +3     

Impacted Files	Coverage Δ
emitterc.go	56.55% <89.47%> (+0.65%)	⬆️

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