Add integral model solutions #27

Job	Run time
source check	37s
sdist on ubuntu-latest with py 3.8	32s
sdist on ubuntu-latest with py 3.9	27s
sdist on ubuntu-latest with py 3.10	26s
sdist on ubuntu-latest with py 3.11	24s
sdist on ubuntu-latest with py 3.12	30s
sdist on windows-latest with py 3.8	59s
sdist on windows-latest with py 3.9	1m 6s
sdist on windows-latest with py 3.10	1m 20s
sdist on windows-latest with py 3.11	1m 12s
sdist on windows-latest with py 3.12	1m 17s
sdist on macos-13 with py 3.8	49s
sdist on macos-13 with py 3.9	34s
sdist on macos-13 with py 3.10	46s
sdist on macos-13 with py 3.11	37s
sdist on macos-13 with py 3.12	46s
upload_to_pypi	19s
	12m 41s

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