multi-byte text decoding error can break word splitting by read at least

[Stephane Chazelas <stephane@xxxxxxxxxxxx>]

There was some recent bug report on the bash mailing list about
"read" missing the delimiter when it followes a truncated
character, but zsh has similar issues when it comes to do doing
IFS splitting on the record once it has been read:

$ print 'a\302×b' | IFS=× read -rA a; typeset a
a=( $'a\M-B×b' )

Wasn't split on ×.

One might argue that doing reliable word splitting on non-text
is illusory anyway, but note that the latest version of the
POSIX standard now requires that splitting be done by looking
for the byte encodings of the characters in $IFS which would
make the behaviour above non-conformant.

See https://www.austingroupbugs.net/view.php?id=1920 for some
discussion on that though.

-- 
Stephane