imap called function inserts an extra zero.

" Testing
function! Pastefile( FILE )
let arg_file = $HOME."/.vim/cf3snippets/".a:FILE
let @" = join( readfile( arg_file ), "\n" )
put
endfunction
imap //tmp <c-r>=Pastefile( "template.cf" )<CR><ESC>A


The above imap results in
Code:
bundle agent test {

0}

The zero on the last line is not in the file template.cf. Where does the zero come from?

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