Unexpected special keys' behaviour.

Hello,

In documentation about insert mode (':he insert.txt') there is a following
example:

---------------------------------------------
An example for using CTRL-G u:

:inoremap <C-H> <C-G>u<C-H>

This redefines the backspace key to start a new undo sequence. You can now
undo the effect of the backspace key, without changing what you typed before
that, with CTRL-O u.

---------------------------------------------

When I tested this example, I didn't get the expected behaviour - the result
was as though backspace wasn't redefined. The example started working only
when I defined the mapping as follows:

':inoremap <BS> <C-G>u<BS>'

Also, according to the documentation (':he keycodes'), I expected that
typing ':<ctrl-k><ctrl-h>' will result in string '<BS>' written on the
command line, similarly to ':<ctrl-k><ctrl-@>', which results in string
'<Nul>' written on the command line (I should note that in the last case
most of the keys don't work as I expected, for example ':<ctrl-k><ctrl-[>'
doesn't write the string '<Esc>' etc.).

I see that <ctrl-h> is equivalent to backspace in the sense that in insert
mode <ctrl-h> deletes character before the cursor, similarly to the
backspace.

Why in the cases above I don't get the expected behaviour?

Thanks.

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