Go 1.20 released

Version 1.20 of the Go languagehas been released.

We're particularly excited to launch a preview of profile-guidedoptimization (PGO), which enables the compiler to performapplication- and workload-specific optimizations based on run-timeprofile information. Providing a profile to go build enables thecompiler to speed up typical applications by around 3-4%, and weexpect future releases to benefit even more from PGO. Since this isa preview release of PGO support, we encourage folks to try it out,but there are still rough edges which may preclude production use.

Go 1.20 also includes a handful of language changes, manyimprovements to tooling and the library, and better overallperformance.