If I use a compiled validator and get an error, the errors object (associated with the validator function), has a dataPath field which has the value [object Object]. I suspect that it is being copied in the process of validation.

I also enjoyed having the errorsText() function to produce a helpful error message. Apparently, this feature is not afforded to compiled validation functions. That's unfortunate and unexpected (as compiled validator functions have the same needs as those invoked via the ajv instance method).

Finally, for thread safety purposes (since I would expected compiled functions to be reused by many threads), why not simply return an errors object instead of a boolean?