[perl #131365] [IO] IO::Handle.getc returns too-many chars at the end of file

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# New Ticket Created by  Zoffix Znet 
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IRC: https://irclog.perlgeek.de/perl6-dev/2017-05-25#i_14636375

Note how the last item in the returned list contains a string with more than on 
character:

15:17   Zoffix  m: with '/tmp/foo70'.IO { .spurt: "a♥c"; with .open { dd ( 
.getc xx 10 ) } }
15:17   camelia         rakudo-moar 428324: OUTPUT: «("a", "♥c", Nil, Nil, Nil, 
Nil, Nil, Nil, Nil, Nil).Seq␤»
15:17   Zoffix  m: with '/tmp/foo70'.IO { .spurt: "a♥cd"; with .open { dd ( 
.getc xx 10 ) } }
15:17   camelia         rakudo-moar 428324: OUTPUT: «("a", "♥", "cd", Nil, Nil, 
Nil, Nil, Nil, Nil, Nil).Seq␤»