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add support for properly typed maps #2218

Job	Run time
validate	18s
docs / Build linux64	1m 42s
test / Windows MSVC / Build win64	6h 0m 14s
test / Linux gcc-11 / Build linux64	1m 12s
test / Linux gcc-12 / Build linux64	1m 27s
test / Run Linux test suite (gcc-12, all plugins)	0s
test / Run Linux test suite	0s
test / Run Windows test suite (empty config)	0s
test / Run Windows test suite	0s
	6h 4m 53s

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