Setting cedit= causes vimincr :I to fail

I've been having a problem using Dr. Chip's visincr plugin that I
finally tracked down to this setting in my ~/.vimrc:

set cedit=<Esc>

With that setting, using :I on the example in ":help visincr-usage"
results in changing this

ORIG
+---+
| 8 |
| 8 |
| 8 |
| 8 |
+---+

to this

ORIG
+---+
8 8 |
9 8 |
10 8 |
11 8 |
+---+

with the incremented numbers moved to the left instead of replacing
the original column of 8s.

I further discovered that the problem occurs when one of these two
lines in autoload/visincr.vim is executed:

645 exe 'norm! /\%'.leftcol."v\<Esc>"
677 exe 'norm! /\%'.bkup."v\<Esc>"

I can solve the problem by surrounding that part of the code in
visincr#VisBlockIncr() with

let l:cedit = &cedit
set cedit&

and

let &cedit = l:cedit

which is what I recommend Dr. Chip do, but it bothers me that
"norm!" was not sufficient to prevent my setting of 'cedit' from
corrupting his use of "<Esc>".

Should the function of "!" in :normal and of "nore" in mappings be
extended to also ignore any non-default settings of 'cedit'?

Regards,
Gary

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