Uwe Brauer writes:
 that's why I am asking is it recommendable to use it via
 		   (require 'un-define)
 and 
        (set-default-coding-systems 'utf-8)   
You must use Mule-UCS with 21.4 to get any Unicode support at all.
You should never use Mule-UCS with 21.5 as it provides no Unicode
features that 21.5 doesn't, and makes a mess of things internally.  If
there are Mule-UCS APIs that you want to use in 21.5, we should
implement them using 21.5 native function.
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