Does :global convert tabs to spaces prior to sending to the screen?

I have the following function in my .vimrc


command! -nargs=+ -complete=command TabMessage call TabMessage(<q-args>)
function! TabMessage(cmd)
redir => message
silent execute a:cmd
redir END
tabnew
silent put=message
set nomodified
endfunction



basically it redirect message to a new tab.
however when I run
:TabMessage g//

tabs my buffer get stripped on there way to the new tab.

Thoughts?

Thanks.

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