There are a few properties on Wikidata where people have entered “one of” constraints with integer values instead of items:

• Mohs’ hardness: One of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
• oxidation state: One of -4,-3,-2,-1,0,1,2,3,4,5,6,7,8.
• parity: One of -1, 1.
• Wikidata month number: One of 1,2,3,4,5,6,7,8,9,10,11,12. (This property is being considered for deletion.)

Do we need to support this? These aren’t so much “one of” constraints as rather “range” constraints combined with “must be integer”, which is not a constraint that currently exists, but might be separately useful anyways.