Github user joewitt commented on the issue: https://github.com/apache/nifi/pull/2015 went ahead and fixed the typo and squashed locally. Ran a test flow that created csv of various conformity to a simple spec. Ran it through various configratuions of the validator and it behaved as desired and expected in each case. When data was marked invalid was able to see precisely why through the provenance events which was great. Was able to see coercion/non-coercion behavior and all checks out. +1 merging to master
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