This breaks some tests in test/externals/ruby1.9/test_open3.rb 😠

@atambo You still figuring out those new failed tests in test_open3.rb?

Ya, I'll give it another shot soonish.

@headius Is this something @atambo should still work on with your mega branch of IO rework? I do not think we have plans to backport that to 1.7 but you might have some partial backports for logic like this?

@atambo I probably derailed this issue by asking about master. 1.7.x is long-lived and this is causing enough real-world problems to need fixing.

JRuby master incorporates an unmodified open3 from MRI, since we now have better support for the features involved. We can still patch for 1.7.17 if this patch is still valid or can be updated.

I'm on it.

I have a lighter-weight fix that appears to be working. Will push shortly.