Generalize so labels don't have to be stored in a Tuple

[mtfishman]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 91.66%. Comparing base (11f8157) to head (55a347a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/BaseExtensions/indexin.jl	25.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #19   +/-   ##
=======================================
  Coverage   91.66%   91.66%           
=======================================
  Files          16       16           
  Lines         360      360           
=======================================
  Hits          330      330           
  Misses         30       30           

Flag	Coverage Δ
docs	0.00% <0.00%> (ø)

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