wp_set_post_tags() doesn't always replace old tags when $append is false

[henry.wright]

If the 3rd argument passed to wp_set_post_tags() is false, new tags will replace old tags.

Imagine if post 42 is currently tagged "foo".

wp_set_post_tags( 42, array( 'bar' ), false );

Post 42 is now tagged "bar".

However, imagine this scenario:

wp_set_post_tags( 42, array(), false );

Post 42 is still tagged "bar".

[henry.wright]

I retested this and old tags are replaced. Closing.