What about this commit?
https://github.com/rakudo/rakudo/commit/0704cd97226e63001943426666c88cef1c5fe711

On 2017-09-12 13:55:51, david.warring wrote:
> current behavior of isa method on a subset:
>
> % perl6 -v
> This is Rakudo version 2017.08-110-g5f3350656 built on MoarVM version
> 2017.08.1-156-g4
> 9b90b99
> implementing Perl 6.c.
> % perl6 -e'subset S of Int; say S.isa(Int)'
> Cannot resolve caller isa(Perl6::Metamodel::SubsetHOW: S, Int); none of
> these signatur
> es match:
> (Mu \SELF: Mu $type, *%_)
> (Mu \SELF: Str:D $name, *%_)
> in block <unit> at -e line 1
>
> The documentation https://docs.perl6.org/routine/isa implies this should
> return True.

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