Allowing extension of a previous cache.

[murrellb]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 31.76471% with 58 lines in your changes missing coverage. Please review.

Project coverage is 58.77%. Comparing base (5a73614) to head (0ad7210).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
src/utils.jl	3.44%	28 Missing ⚠️
src/model.jl	34.61%	17 Missing ⚠️
src/cache.jl	0.00%	6 Missing ⚠️
src/layers.jl	62.50%	6 Missing ⚠️
src/sampling.jl	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            main      #17       +/-   ##
==========================================
+ Coverage   0.00%   58.77%   +58.77%     
==========================================
  Files          6        6               
  Lines        288      342       +54     
==========================================
+ Hits           0      201      +201     
+ Misses       288      141      -147     

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