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This PR fixes the duplicate tag check. There were two issues. First, the subgroup array iterator in
ParsedTagGroup
was only returning the tags, excluding any groups. Also, only the top-level tags (not groups) were checked. Both were fixed, and the ensuing issue with the unique tag check was also mitigated. The JSON spec tests for duplicate tags were ported to the main JavaScript testcases for verification.In order to make the sidecar tests pass, tag level validation (duplicate and unique tags) were moved up to string-level validation.