wp_get_object_terms returns an array of strings when asked for IDs

[kovshenin]

When calling wp_get_object_terms with the fields => 'ids' argument, the function returns an array of IDs which are strings and not integers. The wp_set_object_terms accepts an array of IDs, but if the IDs are strings, it results in a bunch of new terms. Here's a workaround:

$terms = wp_get_object_terms( $post_id, $taxonomy, array( 'fields' => 'ids ) );
$terms = array_map( 'absint', $terms ); // boo :(
wp_set_object_terms( $other_post_id, $terms, $taxonomy );

Duplicate of #17646.