Add user functions #51

Job	Run time
test (ubuntu-latest, 26.3, false)	1m 18s
test (ubuntu-latest, 27.2, false)	1m 19s
test (ubuntu-latest, 28.2, false)	1m 22s
test (ubuntu-latest, 29.1, false)	1m 17s
test (macos-latest, 26.3, false)	3m 35s
test (macos-latest, 27.2, false)	4m 20s
test (macos-latest, 28.2, false)	5m 26s
test (macos-latest, 29.1, false)	7m 16s
test (windows-latest, 26.3, false)	1m 20s
test (windows-latest, 27.2, false)	51s
test (windows-latest, 28.2, false)	49s
test (windows-latest, 29.1, false)	43s
test (ubuntu-latest, snapshot, true)	1m 12s
test (macos-latest, snapshot, true)	4m 12s
test (windows-latest, snapshot, true)	49s
	35m 49s

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