Add integral model solutions #26

Job	Run time
source check	37s
sdist on ubuntu-latest with py 3.8	30s
sdist on ubuntu-latest with py 3.9	27s
sdist on ubuntu-latest with py 3.10	27s
sdist on ubuntu-latest with py 3.11	25s
sdist on ubuntu-latest with py 3.12	27s
sdist on windows-latest with py 3.8	1m 22s
sdist on windows-latest with py 3.9	1m 22s
sdist on windows-latest with py 3.10	1m 20s
sdist on windows-latest with py 3.11	1m 30s
sdist on windows-latest with py 3.12	1m 22s
sdist on macos-13 with py 3.8	52s
sdist on macos-13 with py 3.9	39s
sdist on macos-13 with py 3.10	34s
sdist on macos-13 with py 3.11	38s
sdist on macos-13 with py 3.12	54s
upload_to_pypi	17s
	13m 43s

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