redirect_canonical() on using permalink: Not all $_GET being redirected

[arieputranto]

Using permalink, I suppose that all query_var entered manually on URL or using $_GET will be redirected to proper permalink. Apparently not all being redirected at all. AFAIC:

1. /?post_format=image : should be redirected to /type/image/
2. /?pagename=blog : should be redirected to /blog/
3. /?author_name=admin : should be redirected to /author/admin/

Unfortunately, they are not.

It can be done by filtering redirect_canonical() but it will be better if it's being done by default as we can see that /?category_name=cat will be redirected to /category/cat/

Confirmed all 3 issues are still current, There are existing tickets for 2 & 3 I believe.

20920.diff​ fixes all three scenarios, mainly by adding logic to canonical.php. As for the post format canonical redirects, the current tax query redirects seems to handle tags, categories and custom taxonomy well, but the extra post_type query argument added in _post_format_request prevented it from doing so.

I feel weird that categories, tags and custom post types won't append the post_type argument, even if added to other object types with register_taxonomy_for_object_type, so I don't understand the reason why it's there for post formats, since post formats is a taxonomy, just like everything else, except that it has a custom admin interface. Would like feedback on this from Andrew and/or Mark, see [17249].