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buffer-swap-text and multibyteness

From: Eli Zaretskii
Subject: buffer-swap-text and multibyteness
Date: Sat, 31 Jan 2009 16:52:02 +0200 
set-buffer-multibyte jumps through the hoops to DTRT.

By contrast, in buffer-swap-text we do just this:

  swapfield (enable_multibyte_characters, Lisp_Object);

Could this cause trouble, e.g. if one of the buffers whose text is
swapped contains eight-bit characters?
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