This isn't really a bug in Parslet, but this is where it manifested and I figured somebody else might run into it at some point. See: https://github.com/tenderlove/psych/issues/50. The fix from the Parslet side is to have Context extend BasicObject instead of BlankSlate, but BasicObject was only added in 1.9.3, so it'll break backwards compatibility if it's switched. It might be worth adding some sort of warning for people upgrading to 1.9.3.
This isn't really a bug in Parslet, but this is where it manifested and I figured somebody else might run into it at some point. See: https://github.com/tenderlove/psych/issues/50. The fix from the Parslet side is to have Context extend BasicObject instead of BlankSlate, but BasicObject was only added in 1.9.3, so it'll break backwards compatibility if it's switched. It might be worth adding some sort of warning for people upgrading to 1.9.3.