Add integral model solutions #30

Job	Run time
source check	34s
sdist on ubuntu-latest with py 3.8	28s
sdist on ubuntu-latest with py 3.9	25s
sdist on ubuntu-latest with py 3.10	30s
sdist on ubuntu-latest with py 3.12	27s
sdist on windows-latest with py 3.9	1m 16s
sdist on ubuntu-latest with py 3.11	24s
sdist on macos-13 with py 3.9	37s
sdist on windows-latest with py 3.8	1m 18s
sdist on windows-latest with py 3.11	1m 38s
sdist on macos-13 with py 3.11	47s
sdist on macos-13 with py 3.8	32s
sdist on windows-latest with py 3.12	1m 18s
sdist on macos-13 with py 3.10	30s
sdist on windows-latest with py 3.10	1m 15s
sdist on macos-13 with py 3.12	46s
upload_to_pypi	6s
	12m 51s

Provide feedback