Golang Maps: How Swiss Tables Replaced the Old Bucket Design

Deep dive on Go’s map internals in Go 1.24 and how the runtime moved from the classic bucket + overflow-chain design to a Swiss Table-inspired implementation: * what changed structurally in the runtime * how control bytes and h2 filtering reduce wasted key comparisons * why this improves cache behavior and practical load factors * Go-specific constraints (iteration semantics, GC integration, incremental growth behavior) * benchmark context and caveats (microbench wins vs smaller app-level geomean gains) * current trade-offs and open performance areas