Add integral model solutions #24

Job	Run time
source check	18s
sdist on ubuntu-latest with py 3.7	38s
sdist on ubuntu-latest with py 3.8	25s
sdist on ubuntu-latest with py 3.9	29s
sdist on ubuntu-latest with py 3.10	29s
sdist on ubuntu-latest with py 3.11	24s
sdist on windows-latest with py 3.7	1m 28s
sdist on windows-latest with py 3.8	1m 24s
sdist on windows-latest with py 3.9	1m 45s
sdist on windows-latest with py 3.10	1m 36s
sdist on windows-latest with py 3.11	1m 20s
sdist on macos-latest with py 3.7	6s
sdist on macos-latest with py 3.8	59s
sdist on macos-latest with py 3.9	24s
sdist on macos-latest with py 3.10	22s
sdist on macos-latest with py 3.11	24s
upload_to_pypi	0s
	12m 31s

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