Add support for variable length custom tags #93

Job	Run time
lint and style checks	18s
test (windows-latest, 3.8, false, false)	1m 9s
test (windows-latest, 3.9, false, false)	1m 4s
test (windows-latest, 3.10, false, false)	1m 4s
test (ubuntu-latest, 3.8, false, false)	1m 3s
test (ubuntu-latest, 3.9, false, false)	1m 18s
test (ubuntu-latest, 3.10, false, false)	1m 18s
test (macos-latest, 3.8, false, false)	1m 6s
test (macos-latest, 3.9, false, false)	1m 5s
test (macos-latest, 3.10, false, false)	1m 3s
test (3.11, ubuntu-latest, true, false)	1m 8s
test (3.10, ubuntu-latest, false, true)	1m 17s
coveralls	1s
	12m 54s

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