[Q] Prevent infinite recursion with undecided coding system

[Aidan Kehoe]

 Ar an chéad lá de mí Lúnasa, scríobh Stephen J. Turnbull: 

 > Aidan Kehoe writes:
 > 
 >  > It looks like Qbinary would be more correct in both places, but then
 >  > handling code will be more ready to deal with Qraw_text, since it can
 >  > return that already.
 > 
 > I don't understand this comment.  This function can already return
 > Qbinary, no?

Right, if the coding cookie specifies that, for example. But
detected_coding_system returns Qraw_text on no match, as Michael says, and
in the context of ‘no match’ that will be a little more expected. My comment
was unclear to the extent that it was wrong.

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