MixedDuplicated for custom rules

[wsmoses]

No description provided.

[github-actions]

Benchmark Results

	main	fdb235f...	main/fdb235fb5c0f7d...
basics/overhead	4.64 ± 0.01 ns	4.64 ± 0.01 ns	1
time_to_load	0.409 ± 0.0058 s	0.42 ± 0.0098 s	0.974

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 87.00000% with 13 lines in your changes missing coverage. Please review.

Project coverage is 68.29%. Comparing base (bd60907) to head (fdb235f).

Files	Patch %	Lines
src/rules/customrules.jl	87.69%	8 Missing ⚠️
src/compiler.jl	85.71%	5 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1534      +/-   ##
==========================================
- Coverage   68.30%   68.29%   -0.02%     
==========================================
  Files          30       30              
  Lines       11953    12029      +76     
==========================================
+ Hits         8165     8215      +50     
- Misses       3788     3814      +26     

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