completing-read in E21

[Mario Lang]

Hello..

I noticed the following text when doing C-h f completing-read RET:

...

If INITIAL-INPUT is non-nil, insert it in the minibuffer initially.
  If it is (STRING . POSITION), the initial input
  is STRING, but point is placed POSITION characters into the string.
  This feature is deprecated--it is best to pass nil for INITIAL.

Can anyone tell me why this nice feature of completing-read is
considered deprecated and what to use instead to get the same functionality?

-- 
CYa,
   Mario <address@hidden>
Homepage(s): http://delysid.org | http://piss.at/

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