Fully stabilize now-stable protocol properties#1686
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… plumbing) Removes the internal *Core JSON plumbing from ClientCapabilities.Extensions, ServerCapabilities.Extensions, RequestParams.InputResponses, and RequestParams.RequestState, converting them to plain public [JsonPropertyName] auto-properties. PR #1642 removed [Experimental] from these but left the workaround plumbing from #1301, so consumer-defined source-gen contexts still silently dropped them. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
eiriktsarpalis
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PranavSenthilnathan,
halter73 and
jeffhandley
PranavSenthilnathan
approved these changes
Jul 1, 2026
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#1301 hid experimental JSON properties from consumer source generators using an internal
*Coretwin pattern (public[JsonIgnore]+ internal[JsonInclude]). #1642 later removed[Experimental]fromClientCapabilities.Extensions,ServerCapabilities.Extensions,RequestParams.InputResponses, andRequestParams.RequestStatebut left that plumbing in place — so consumer-definedJsonSerializerContexts still silently dropped these now-stable properties.This removes the
*Coretwins and converts the four properties to plain public[JsonPropertyName]auto-properties. Wire format is unchanged; consumer source-gen contexts now round-trip them correctly.ExperimentalPropertySerializationTests.csis deleted because it asserted the #1301 drop-by-consumer-context behavior, which no longer applies.