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precision not working properly for strings in Printf?

Quôc_Peyrot
- Jonathan Bryant
  - Quôc_Peyrot
    - Jonathan Bryant
      - Vincent Hanquez
        
        Jonathan Bryant
        
        David Thomas
        
        Quôc_Peyrot
        
        Quôc_Peyrot

Date:	-- (:)
From:	Quôc_Peyrot <chojin@l...>
Subject:	precision not working properly for strings in Printf?

It seems that the precision field doesn't work properly with the "s"  
type in Printf.printf:

# Printf.printf "%.2s" "qwerty";;
qwerty- : unit = ()

This should print "qw"

-- 
Best Regards,
Quôc