r()   {    throw new global::System.NotSupportedException();   }   #endif   #if __ANDROID__ || __IOS__ || NET000 || __WASM__ || __SKIA__ || __NETSTD_REFERENCE__ || __MACOS__   // DeclaringType: System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<string, Windows.Data.Json.IJsonValue>>   [global::Uno.NotImplemented("__ANDROID__", "__IOS__", "NET000", "__WASM__", "__SKIA__", "__NETSTD_REFERENCE__", "__MACOS__")]   public bool Contains( global::System.Collections.Generic.KeyValuePair<string, global::Windows.Data.Json.IJsonValue> item)   {    throw new global::System.NotSupportedException();   }   #endif   #if __ANDROID__ || __IOS__ || NET000 || __WASM__ || __SKIA__ || __NETSTD_REFERENCE__ || __MACOS__   // DeclaringType: System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<string, Windows.Data.Json.IJsonValue>>   [global::Uno.NotImplemented("__ANDROID__", "__IOS__", "NET000", "__WASM__", "__SKIA__", "__NETSTD_REFERENCE__", "__MACOS__")]   public void C