Also map types in Implicits.emitDictionary #43162

Job	Run time
scalafmt	45s
build-sdk-package / build	13m 53s
stdlib-tests	-1s
test_windows_full	-1s
build-msi-package	-1s
test-msi-package	-1s
publish_release	-1s
build-chocolatey-package / build	26s
test-chocolatey-package	-1s
	14m 58s

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