On second thought, this has to be turned on explicitly for implementation reasons, so there's no backwards compat issue. "use Test::SharedFork" would simply turn on that feature in Test::Builder 1.5 providing a way to smoothly transition between 0.9x and 1.5.
See https://github.com/schwern/test-more/issues/334 for all the implementation details. -- I'm pale as Formica, social skills stunted small. But I'm accurate like a pica, I know the capital of Nepal. I'm the nemesis of error, dreadful diction fears my skills, more inquisitive than Jim Lehrer, snottier than Beverly Hills. -- I.L.O.P. Secret Rap http://goats.com/archive/020830.html