feat: improve unmarshaller performance

[bdraco]

Avoid some more dict lookups

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.63%. Comparing base (d376bb1) to head (d5e0ebd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #360      +/-   ##
==========================================
+ Coverage   83.48%   83.63%   +0.14%     
==========================================
  Files          28       28              
  Lines        3354     3354              
  Branches      604      603       -1     
==========================================
+ Hits         2800     2805       +5     
+ Misses        346      341       -5     
  Partials      208      208              

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[codspeed-hq]

CodSpeed Performance Report

Merging #360 will not alter performance

_{Comparing flags_types (d5e0ebd) with main (d376bb1)}

Summary

✅ 3 untouched benchmarks

[bdraco]

~1%

not worth the change