implement faster HashMap and test spec #20

Job	Run time
cpp-lib-build (macos-11, clang, ON)	7m 46s
cpp-lib-build (macos-11, clang, OFF)	9m 44s
build (macos-11, tool)	2m 33s
build (macos-11, cpp)	37m 33s
cpp-lib-build (macos-11, gcc, ON)	7m 50s
build (macos-11, csharp)	9m 47s
cpp-lib-build (macos-11, gcc, OFF)	14m 47s
build (macos-11, dart)	5m 48s
cpp-lib-build (ubuntu-20.04, clang, ON)	3m 35s
build (macos-11, go)	4m 56s
cpp-lib-build (ubuntu-20.04, clang, OFF)	3m 21s
build (macos-11, java)	2m 53s
cpp-lib-build (ubuntu-20.04, gcc, ON)	4m 25s
build (macos-11, javascript)	2m 47s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	4m 50s
build (macos-11, typescript)	22m 51s
cpp-lib-build (windows-2022, clang, ON)	4m 6s
cpp-lib-build (windows-2022, clang, OFF)	5m 56s
build (macos-11, php)	23s
cpp-lib-build (windows-2022, cl)	4m 36s
build (macos-11, python3)	2m 7s
build (ubuntu-20.04, tool)	58s
build (ubuntu-20.04, cpp)	17m 22s
build (ubuntu-20.04, csharp)	5m 5s
build (ubuntu-20.04, dart)	3m 27s
build (ubuntu-20.04, go)	2m 18s
build (ubuntu-20.04, java)	1m 9s
build (ubuntu-20.04, javascript)	1m 30s
build (ubuntu-20.04, typescript)	10m 7s
build (ubuntu-20.04, php)	1m 30s
build (ubuntu-20.04, python3)	1m 3s
build (windows-2022, tool)	2m 3s
build (windows-2022, cpp)	22m 25s
build (windows-2022, csharp)	7m 50s
build (windows-2022, dart)	4m 52s
build (windows-2022, go)	5m 35s
build (windows-2022, java)	2m 25s
build (windows-2022, javascript)	2m 47s
build (windows-2022, typescript)	23m 48s
build (windows-2022, php)	2m 16s
build (windows-2022, python3)	1m 42s
	4h 42m 46s

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