Reference implementation for PEP 828 #2330

Job	Run time
x86_64-unknown-linux-gnu/gcc-free-threading	6m 10s
x86_64-pc-windows-msvc/msvc-free-threading	5m 11s
aarch64-unknown-linux-gnu/gcc	6m 11s
x86_64-pc-windows-msvc/msvc	6m 0s
x86_64-apple-darwin/clang	6m 12s
aarch64-apple-darwin/clang	6m 13s
x86_64-unknown-linux-gnu/gcc	6m 11s
	42m 8s

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