don't raise a warning for identical units #402

Job	Run time
Doc test (ubuntu-latest, 3.13)	34s
Script definition completeness test (ubuntu-latest, 3.13)	10s
Test coverage (ubuntu-latest, 3.10, <1.23, <6.1)	1m 9s
API doc completeness test (ubuntu-latest, 3.13)	27s
Style check (ubuntu-latest, 3.13)	15s
Unit tests (ubuntu-latest, 3.11, <2.0, <6.1)	48s
Unit tests (ubuntu-latest, 3.11, <2.0, <7.0)	44s
Unit tests (ubuntu-latest, 3.11, <2.1, <6.1)	48s
Unit tests (ubuntu-latest, 3.11, <2.1, <7.0)	47s
Unit tests (ubuntu-latest, 3.11, <2.2, <6.1)	48s
Unit tests (ubuntu-latest, 3.11, <2.2, <7.0)	47s
Unit tests (ubuntu-latest, 3.11, <3, <6.1)	50s
Unit tests (ubuntu-latest, 3.11, <3, <7.0)	47s
Unit tests (ubuntu-latest, 3.12, <2.0, <6.1)	51s
Unit tests (ubuntu-latest, 3.12, <2.0, <7.0)	51s
Unit tests (ubuntu-latest, 3.12, <2.1, <6.1)	54s
Unit tests (ubuntu-latest, 3.12, <2.1, <7.0)	50s
Unit tests (ubuntu-latest, 3.12, <2.2, <6.1)	57s
Unit tests (ubuntu-latest, 3.12, <2.2, <7.0)	52s
Unit tests (ubuntu-latest, 3.12, <3, <6.1)	55s
Unit tests (ubuntu-latest, 3.12, <3, <7.0)	54s
Unit tests (ubuntu-latest, 3.10, <1.23, <6.1)	50s
Unit tests (ubuntu-latest, 3.13, <3, <7.0)	1m 0s
	17m 48s

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