I observe a problem (see testcase below) with ksh's read -n.
(Version 93t 2008-11-04 on Cygwin).
Bash's behaviour would be what I expect.
Ksh doesn't read the second line and doesn't terminate output.
(Maybe an old bug fixed in newer versions? Or am I missing something?)
--snip--
$ cat readtest
while IFS= read -n16 -r line
do
printf "'%s'\n" "$line"
done <<EOT
ABCDEFGHIJ1234567890
abcdefghij1234567890
EOT
$ bash readtest | head
'ABCDEFGHIJ123456'
'7890'
'abcdefghij123456'
'7890'
$ ksh readtest | head
'ABCDEFGHIJ123456'
'7890'
''
''
''
''
''
''
''
''
$ ksh --version
version sh (AT&T Research) 93t 2008-11-04
--snip--
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