[perl #131185] [IO] IO::Path.perl doesn't roundtrip

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# New Ticket Created by  Zoffix Znet 
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Filing this so I don't forget to fix it as part of the grant.

IO::Path.perl passes named args to .IO coercer, but they're ignored:

18:16   Zoffix  m: dd ".".IO.WHAT.new(".", 
:SPEC(IO::Spec::Win32)).perl.EVAL.perl
18:16   camelia         rakudo-moar d27266: OUTPUT: 
«"\".\".IO(:SPEC(IO::Spec::Unix),:CWD(\"/home/camelia\"))"␤»