IPC::Run test hang under 5.8.5 and 5.8.6

Upgrading from my 5.8.4 to 5.8.6, I found this.  cygwin dll is 1.5.12.

IPC::Run is hanging in t/run after test 62.  The hang happens in this:

$ perl5.8.6 -MIPC::Run=run -we'$in="-"x 20000 ."end\n";$out="REPLACE ME"; run([
$^X, ("-e", qq!print"="x20000;<STDIN>;!)],\$in,\$out)'

but not under my 5.8.4 build.  The cygwin release of 5.8.5 also hangs.
Not sure what to make of this; there have been some pipe changes in cygwin
recently, but I'd expect 5.8.4 to fail also if it were due to those.

Anyone have any ideas or advice?



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