[perl #119001] Passing a string that looks like an integer fails to match MAIN(Str)

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# New Ticket Created by  Rob Hoelz 
# Please include the string:  [perl #119001]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=119001 >


If I define a MAIN sub with a Str parameter and pass an integer
argument, the type check fails and MAIN is never called. '10' is
technically a string, so I think it should still pass a string to MAIN. 
(Example code attached)

use v6;

sub MAIN(Str $value) {
}

# output when I run perl6 main-str-int-argument.p6 10:
#`(
$ perl6 main-str-int-argument.p6 10
Usage:
  main-str-int-argument.p6 <value>
)