[perl #125616] Tapping stdout/stderr in Proc::Async on MoarVM doesn't close stdout/stderr pipes

[via RT]

# New Ticket Created by  Rob Hoelz 
# Please include the string:  [perl #125616]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=125616 >


See the attached test file.

If you tap standard output or standard error in Proc::Async, MoarVM sets up a 
pipe that doesn't seem to ever get closed.

test.p6
Description: Binary data