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The typical way to implement union types in Go is to use an interface where the set of types is limited. However, there historically has been poor support in v1 "encoding/json" with interface types where you can marshal such values, but fail to unmarshal them since type information about the concrete type is lost. The MakeInterfaceCoders function constructs custom marshal/unmarshal functions such that the type name is encoded in the JSON representation. The set of valid concrete types for an interface must be statically specified for this to function. Updates tailscale/corp#22024 Signed-off-by: Joe Tsai <joetsai@digital-static.net>