get_post_permalink tries is_wp_error on get_post which it will never be

[renegeuze]

get_post_permalink incorrectly calls is_wp_error on the result of get_post($id). Instead it should check for !($post instanceof \WP_Post) or just $post === false, since at this location it won't ever be an array either.

Documentation is wrong too - but I assume that's generated from docBlock.

To reproduce: get_post_permalink('whatever-argument-that-does-not-resolve-an-existing-post');
Expected result: return false(or an actual WP_Error but other code like get_permalink() does not expect it)