I submitted a patch to support decimal commas when parsing timestamps in Go in 2013. I thought this was a slam dunk because while major users of decimal dots include USA, China, India, and Japan, the decimal comma is used by pretty much every other country in the world. Going from ~40% support to ~99.9% support seemed like an obvious win.

Rob Pike politely declined the patch, commenting "I might prefer to leave it unaddressed for the moment. Proper locale treatment is coming (I hope soon) and this seems like the wrong place to start insinuating special locale handling into the standard library."

Three years later another Go team member commented that "Date localization is definitely still in the planning."

We're in year 8 now. The issue is still open. Rob Pike is still hoping.