Unit tests

Add documentation for string formats; fix `at-identifier` format #805

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Run time

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Job	Run time
unit_tests (macos-latest, 3.8)	1m 45s
unit_tests (macos-latest, 3.9)	47s
unit_tests (macos-latest, 3.10)	43s
unit_tests (macos-latest, 3.11)	32s
unit_tests (macos-latest, 3.12)	33s
unit_tests (macos-latest, 3.13)	40s
unit_tests (ubuntu-latest, 3.8)	47s
unit_tests (ubuntu-latest, 3.9)	48s
unit_tests (ubuntu-latest, 3.10)	53s
unit_tests (ubuntu-latest, 3.11)	49s
unit_tests (ubuntu-latest, 3.12)	54s
unit_tests (ubuntu-latest, 3.13)	57s
unit_tests (windows-latest, 3.8)	1m 8s
unit_tests (windows-latest, 3.9)	1m 14s
unit_tests (windows-latest, 3.10)	1m 30s
unit_tests (windows-latest, 3.11)	1m 39s
unit_tests (windows-latest, 3.12)	1m 32s
unit_tests (windows-latest, 3.13)	2m 35s
	19m 46s