Narrow Flaggable type constraint

[FollowTheProcess]

Summary

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.88%. Comparing base (827d625) to head (f751ee3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/flag/flag.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #132      +/-   ##
==========================================
- Coverage   91.91%   91.88%   -0.03%     
==========================================
  Files           6        6              
  Lines        1348     1344       -4     
==========================================
- Hits         1239     1235       -4     
  Misses         77       77              
  Partials       32       32              

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