minLength: function (report, schema) {
        // http://json-schema.org/latest/json-schema-validation.html#rfc.section.5.2.2.1
        if (Utils.whatIs(schema.minLength) !== "integer") {
            report.addError("KEYWORD_TYPE_EXPECTED", ["minLength", "integer"]);
        } else if (schema.minLength < 0) {