Cache tricks.

[murrellb]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 55.06%. Comparing base (648f106) to head (e9fc429).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/layers.jl	0.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
- Coverage   57.42%   55.06%   -2.37%     
==========================================
  Files           6        6              
  Lines         350      365      +15     
==========================================
  Hits          201      201              
- Misses        149      164      +15     

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