Go 1.20 released

We’re particularly excited to launch a preview of profile-guided
optimization (PGO), which enables the compiler to perform
application- and workload-specific optimizations based on run-time
profile information. Providing a profile to go build enables the
compiler to speed up typical applications by around 3–4%, and we
expect future releases to benefit even more from PGO. Since this is
a 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, many
improvements to tooling and the library, and better overall
performance.