Issue #604: Go experiments, explained — Go Weekly

Go Weekly issue #604 covers several Go topics: an explanation of Go's experimental features system (how to find, enable, and graduate them to GA), a deep dive into how Go builds stack traces from panic() to terminal output, a pprof-driven memory investigation of the new Go-based TypeScript compiler (tsgo), guides on self-calling executables and IPv6 zone URL parsing quirks, socket options that matter for networking performance, and a release of Heimdall 7.2, an enhanced HTTP client for Go with circuit breaker and retry strategies.