Go 1.23 introduced range-over-func iterators, letting for-range loops iterate over user-defined iterator functions. It also added opt-in Go telemetry for collecting toolchain usage and breakage statistics, plus experimental OpenBSD/RISC-V support.
This was the last major release before the telemetry and generics tooling work that shaped Go 1.24.
Full details: https://go.dev/blog/go1.23
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