I think e4cd319f3d6560b76dbc1c7e89aa4d790a2d1e43 should be backported. @naruse (Yui NARUSE) can I backport it?
The others are changesets for default gems stdlibs (irb and io-console).
I prefer to sync released version from upstream for default gems.
io-console-0.5.11.gem was released with the corresponding commits. I think these changesets are okey to backport. f27eb8148f5a72bbacfebfecc7de9305471bb5c9, d5836db1b398a7936b0461b3011db66f6cc8c490, d75f7078c831d45ab5ba2fae4fbb308d01a21e46.