Fix removeOne for internal set #946

Job	Run time
cpp-lib-build (macos-11, clang, ON)	5m 11s
build (macos-11, tool)	1m 45s
cpp-lib-build (macos-11, clang, OFF)	9m 18s
cpp-lib-build (macos-11, gcc, ON)	7m 7s
build (macos-11, cpp)	28m 40s
cpp-lib-build (macos-11, gcc, OFF)	10m 1s
cpp-lib-build (ubuntu-20.04, clang, ON)	2m 38s
build (macos-11, csharp)	9m 38s
cpp-lib-build (ubuntu-20.04, clang, OFF)	4m 7s
build (macos-11, dart)	5m 33s
cpp-lib-build (ubuntu-20.04, gcc, ON)	2m 33s
build (macos-11, go)	4m 31s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	4m 11s
build (macos-11, java)	2m 12s
cpp-lib-build (windows-2022, clang, ON)	5m 10s
build (macos-11, javascript)	2m 26s
cpp-lib-build (windows-2022, clang, OFF)	5m 34s
build (macos-11, typescript)	18m 28s
cpp-lib-build (windows-2022, cl)	4m 41s
build (macos-11, php)	13m 34s
build (macos-11, python3)	1m 57s
build (ubuntu-20.04, tool)	1m 22s
build (ubuntu-20.04, cpp)	17m 16s
build (ubuntu-20.04, csharp)	5m 15s
build (ubuntu-20.04, dart)	3m 28s
build (ubuntu-20.04, go)	2m 16s
build (ubuntu-20.04, java)	1m 16s
build (ubuntu-20.04, javascript)	1m 38s
build (ubuntu-20.04, typescript)	9m 42s
build (ubuntu-20.04, php)	1m 51s
build (ubuntu-20.04, python3)	1m 30s
build (windows-2022, tool)	2m 19s
build (windows-2022, cpp)	22m 50s
build (windows-2022, csharp)	6m 38s
build (windows-2022, dart)	4m 49s
build (windows-2022, go)	6m 1s
build (windows-2022, java)	2m 2s
build (windows-2022, javascript)	2m 53s
build (windows-2022, typescript)	22m 20s
build (windows-2022, php)	2m 11s
build (windows-2022, python3)	1m 44s
	4h 28m 36s

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