Add cap argument to testing mode #564

Job	Run time
Build & verify package	19s
Verify dev env (ubuntu-latest)	16s
Verify dev env (windows-latest)	1m 18s
Build docs & run doctests	13s
Tests on 3.8	17s
Type-check API on 3.8	20s
Tests on 3.9	19s
Type-check API on 3.9	15s
Tests on 3.10	11s
Type-check API on 3.10	20s
Type-check package	19s
Tests on 3.11	18s
Type-check API on 3.11	18s
Tests on 3.12	23s
Type-check API on 3.12	27s
Tests on 3.13	24s
Type-check API on 3.13	28s
Combine & check coverage	16s
Ensure everything required is passing for branch protection	3s
	6m 44s

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