Spotted in production:
[WLc2XQpAMFsAAHnptkUAAABY] /wiki/Special:ConstraintReport/Q76 InvalidArgumentException from line 26 of /srv/mediawiki/php-1.29.0-wmf.13/extensions/Wikidata/extensions/Constraints/includes/ConstraintCheck/Helper/RangeCheckerHelper.php: Unsupported data value type