expand %FILE% improperly

I touch a .vim-template:.md template file and want to expand %FILE% in file start, then I touch a new md file

    :new 2.66.md

I found %FILIE% expanded to 2 instead of 2.66

I check the source 

https://github.com/aperezdc/vim-template/blob/master/plugin/templates.vim#L344-L367

why L344 code use `:r` 3 times

    let l:filen      = expand("%:t:r:r:r")
