":help Cmd-event" says:

    For file read and write commands the |v:cmdarg| variable holds
    the "++enc=" and "++ff=" argument that are effective.  These
    should be used for the command that reads/writes the file.  The
    |v:cmdbang| variable is one when "!" was used, zero otherwise.

    See the $VIMRUNTIME/plugin/netrwPlugin.vim for examples.

That file does not contain any examples of v:cmdbang.  No other .vim
file under $VIMRUNTIME contains "v:cmdbang" either.

Regards,
Gary

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