Russ Cox, for the Go team:

Generics are the most significant change to Go since the release of Go 1, and certainly the largest single language change we’ve ever made. With any large, new feature, it is common for new users to discover new bugs, and we don’t expect generics to be an exception to this rule; be sure to approach them with appropriate caution.

It didn’t make the headline, but fuzzing (tests that automatically find inputs which cause your program to crash or return invalid answers) also made it in the build, which our Go Time team has been quite excited about as well.