Its confusing `denops#plugin#is_loaded()` returns 1 if the plugin state is `failed`

[Milly]

Problem

What's confusing is that denops#plugin#is_loaded() returns 1 if the plugin's state is failed.
In that state, the plugin cannot be used, so it cannot be said loaded.

But document says:

denops.vim/doc/denops.txt

Lines 294 to 297 in 09e6495

 						*denops#plugin#is_loaded()* 
 denops#plugin#is_loaded({name}) 
 	Returns 1 if a {name} plugin is already loaded. Otherwise, returns 
 	0. 

Expected

Detail the documentation.

Your environment

• Denops version: v6.0.11

[Milly]

Fixed in #389, f1ce5d0