net/http race detector mystery, and the gcexportdata bundle API gets the axe

The piece getting attention is a VictoriaMetrics writeup on a net/http data race that turned out not to be a bug, alongside one that was, digging into how the HTTP client actually reads request bodies. On the proposal side, the long-dormant WriteBundle and ReadBundle in x/tools/go/gcexportdata are finally being removed, closing out an experiment that never found users. Elsewhere there's a proposal to teach the time package RFC9557 formatting so UTC and +00:00 stop looking identical.