Regarding ikegami's observation about FFFE and FFFF, I noticed that this is a difference between 5.8.8 and 5.10.0 -- Encode handles these code points in 5.8 but it spits out the error in 5.10.

The error messages I got were from 5.8.8. I don't see any different between 5.8 and 5.10. 

>c:\progs\perl580\bin\perl -e"print qq{\xFE\xFF}" | perl -e"binmode ST
+DIN, ':encoding(UTF-16le)'; <>"
UTF-16LE:Unicode character fffe is illegal at -e line 1.

>c:\progs\perl588\bin\perl -e"print qq{\xFE\xFF}" | perl -e"binmode ST
+DIN, ':encoding(UTF-16le)'; <>"
UTF-16LE:Unicode character fffe is illegal at -e line 1.

>c:\progs\perl5100\bin\perl -e"print qq{\xFE\xFF}" | perl -e"binmode S
+TDIN, ':encoding(UTF-16le)'; <>"
UTF-16LE:Unicode character fffe is illegal at -e line 1.

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In reply to Re^6: Handling malformed UTF-16 data with PerlIO layer by ikegami
in thread Handling malformed UTF-16 data with PerlIO layer by almut

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