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C:\Users\Peter> perl -e "binmode STDOUT, ':raw'; print qq(\x{efbbbf})"
+ | xxd
Wide character in print at -e line 1.
...
C:\Users\Peter> perl -e "use open ':std' => ':encoding(UTF-8)'; print 
+qq(\x{efbbbf})" | xxd
Code point 0xEFBBBF is not Unicode, may not be portable in print at -e
+ line 1.
00000000: 5c78 7b45 4642 4242 467d                 \x{EFBBBF}

C:\Users\Peter> perl -e "binmode STDOUT, ':raw'; print qq(\xef\xbb\xbf
+)" | xxd
00000000: efbb bf                                  ...
...

C:\Users\Peter> perl -e "use open ':std' => ':encoding(UTF-8)'; print 
+qq(\x{feff})" | xxd
00000000: efbb bf                                  ...