Much more prosaic (if slightly embarrassing), I'm afraid: The update was non-trivial (this CL is simple, but there are some accompanying ones in x/text which are not) and it didn't hit the top of the priority list for anyone who understands x/text.
Go is pretty much entirely developed in public; there are some Google-internal customizations but none of them are particularly exciting and almost all changes start in the open source repo and are imported from there.
Go is pretty much entirely developed in public; there are some Google-internal customizations but none of them are particularly exciting and almost all changes start in the open source repo and are imported from there.