Instead of using globs or lexicals, I'm checking about using sockets instead of file handles as used in https://github.com/lucastheisen/ipc-open3-callback. So far, select seems to be working fine, but I need to do more tests (like generating something into the child process STDERR).

Documentation of IPC::Open3 in the Synopsis uses use Symbol 'gensym', which could be applied to all three lexicals. If I'm not wrong, this is the approach used by IPC::Run or IPC::Cmd. Is this expected to fail too?