Change outside_domain to scalar, param as optional #42

Job	Run time
lint (3.8)	9s
test (ubuntu-latest, 3.8)	2m 15s
test (ubuntu-latest, 3.9)	1m 41s
test (ubuntu-latest, 3.10)	1m 57s
test (ubuntu-latest, 3.11)	1m 58s
test (ubuntu-latest, 3.12)	2m 16s
test (macos-latest, 3.8)	2m 31s
test (macos-latest, 3.9)	1m 32s
test (macos-latest, 3.10)	1m 31s
test (macos-latest, 3.11)	1m 31s
test (macos-latest, 3.12)	1m 32s
test (windows-latest, 3.8)	2m 59s
test (windows-latest, 3.9)	3m 46s
test (windows-latest, 3.10)	3m 49s
test (windows-latest, 3.11)	2m 54s
test (windows-latest, 3.12)	2m 59s
test (-r requirements-min.txt, 3.8, ubuntu-latest)	4m 11s
Finish Coveralls	7s
	39m 38s

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