Prototype for decode_utf8 incorrect?

$ perl -MEncode -e'print Encode::decode_utf8(1, 1)'
Too many arguments for Encode::decode_utf8 at -e line 1, at end of line

$ perldoc Encode |grep decode_utf8
       $string = decode_utf8($octets [, CHECK]);


Thanks,
/Autrijus/

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