Add integral model solutions #28

Job	Run time
source check	34s
sdist on ubuntu-latest with py 3.8	29s
sdist on ubuntu-latest with py 3.9	24s
sdist on ubuntu-latest with py 3.10	27s
sdist on ubuntu-latest with py 3.11	31s
sdist on ubuntu-latest with py 3.12	27s
sdist on windows-latest with py 3.8	1m 0s
sdist on windows-latest with py 3.9	1m 30s
sdist on windows-latest with py 3.10	1m 5s
sdist on windows-latest with py 3.11	1m 20s
sdist on windows-latest with py 3.12	1m 2s
sdist on macos-13 with py 3.8	44s
sdist on macos-13 with py 3.9	40s
sdist on macos-13 with py 3.10	38s
sdist on macos-13 with py 3.11	41s
sdist on macos-13 with py 3.12	43s
upload_to_pypi	17s
	12m 32s

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