describe-key key

`key-binding' misinforms user when used by `describe-key' invoked inside "text fields" on a key from extent map (<5a243be96cf489-gin(a)mo.msk.ru>). In particular, `get_relevant_keymaps' <- `key-binding' does not traverse extent keymaps when `keys' arg of `key-binding' is a string, not a vector of events. `key-binding' `keys' arg is copied from `describe-key' `key' which should be vector of events, as `interactive' function description says. And it is when one evaluates (call-interactively (lambda (key) "key arg printer" (interactive "kEnter key: ") key)) and presses a key. But `describe-key' receives string as `key' when user presses key. Does anybody understand why?