Playlist retrieving problem with custom fields
i have jwplatform account and i uploaded some videos and created some playlists.
for playlist i have created one custom field called as "author_id".
when i retrieve playlists by using this service call
$api->call("/channels/list", array("types_filter" => "manual","search:custom.author_id" => "1"));
based on the custom filed author_id it is showing all other playlists which matches atleast one char of author_id.
in the above query i want all playlists whos author_id is 1 but it is showing other playlists also whos author_id is 175 or 517 or 981 etc
i want only playlist whos author id is exactly equal to 1.how to do that?