Custom validators
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nornagon commented
It would be super handy to be able to register custom validators, e.g. for domain-specific format patterns. Mostly I want to do this to improve on the error message given by pattern, which isn't very human-friendly:
#/groups/0/transfer/0/from: bad1 does not match /^[^\/]+\/[A-Za-z][0-9]+$/.
I'd rather:
#/groups/0/transfer/0/from: bad1 is not a valid well.
It'd also be handy to be able to inject totally custom validators, not just new formats.