I noticed many incorrect ISBN numbers in Wikidata. Can you please add a checksum check to give editor a waring before letting ISBN-10 and ISBN-13 properties inserted?
Some ideas can be found at en.wp at Module:ISBNT
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In many cases the template is misused
https://en.wikipedia.org/w/index.php?title=Philadelphia%2C_Mississippi&type=revision&diff=713163874&oldid=711233591
In other cases we can just replace the invalid ISBN with the correct OCLC.
We can follow two strategies: Whether Wikidata gives a warning before final save and marks the ISBN as invalid or does completely disallow the addition of these ISBNs
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This should be handled by Wikidata's existing (soft) constraint system, but there is no way currently to do a "Math" constraint.
Not sure of the exact user name, but you can poke Ivan (A.?) Kristanin on Wikidata to see about adding support.
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Yes as Izno said we are not going to do this in the software itself. It should be done in the constraints.
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I am working on fixing the existing ones manually. Many errors came form Spanish Wikipedia because we have already fixed them in the English Wikipedia.
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I think the edit filter approach works also, but I think it would be better to do it in the constraints. I guess we can use the complex constraint template since you appear to have a query for it.