use of redir => variable

I use a function called "TabMessage" to redirect messages to a new
tab.
It works well except it seems to expand horizontal tabs to spaces.

ie if I run

:TabMessage global /\t/

I do get a new tab with all the lines from the current buffer that
contain tabs, however in the newly created tab will have converted
the horizontal tabs to spaces.

Here is the code i got it from:
http://vim.wikia.com/wiki/Capture_ex_command_output

function! TabMessage(cmd)
redir => message
silent execute a:cmd
redir END
tabnew
silent put=message
set nomodified
endfunction

Am I doing something wrong? I would think variables can contain horz.
tabs?

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