Parse and cache a (possibly constant) oneOrAll argument. @param[in] arg The oneOrAll arg passed to the JSON function. @param[in] string_value String variable to use for parsing. @param[in] cached_ooa Previous result of parsing this arg. @param[in] func_name The name of the calling JSON function. @returns ooa_one, ooa_all, ooa_null or ooa_error, based on the match */
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