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A ZAP field is an offset. Eight of these replies held a map, which has no order to give one, so the reply could not cross between two processes at all. Two more held values whose fields are every one unexported — netip.AddrPort, time.Time — and those are worse: they are not refused, they derive an EMPTY layout, so the reply crossed, reported no error and carried nothing. GetNodeIPReply has one field, so its whole answer was blank. And a health check says what it likes, so its details were an `any`, which has no shape until it holds something. Each map is now a list of a stated element type, ordered by the key it was an object of. An address is the text netip already wrote for it, an instant is three numbers, and a check details are the bytes of their own JSON — the one shape an object, a string and a list all share. The JSON does not move. Every list marshals to the object it replaced and reads one back, and wire_test.go holds that against the old shape spelled out as a literal rather than against itself. The order is new where there was none: a map answered the same question two ways. APIReply also states the status it carries, so the 503 a probe reads and the healthy a person reads are one fact computed once.