(Maybe) Breaking Change
Schema based low-priority validation (triggered by change/blur) now runs at a given schema path using Yup.schema.validateAt (if possible). This means that Yup will run validation against a single slice of the whole schema if it can do so. This should significantly boost perf on underpowered devices. There may be some edge cases that we need to iron out, but neither I or Jason Quense could come up with ones. Regardless, we'll mark this as a breaking change (even though it probably isn't).
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