RcppParallel 4.3.5
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* Use COMSPEC as shell when building on Windows
* Fix for failure to compile on non-TBB platforms
* Fix for failure to compile due to protected members of concurrent_vector

RcppParallel 4.3.4
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* Support for TBB on Windows

RcppParallel 4.3.3
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* Update to TBB 4.3 (fixes clang compilation error in platform.h)
* Forward CXX to TBB Makefile

RcppParallel 4.2.5
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* Initial release
