Reference implementation for PEP 828 #2342

Job	Run time
aarch64-apple-darwin/clang	8m 35s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 38s
aarch64-unknown-linux-gnu/gcc	7m 22s
x86_64-pc-windows-msvc/msvc-free-threading	4m 48s
x86_64-unknown-linux-gnu/gcc	10m 2s
x86_64-apple-darwin/clang	19m 18s
x86_64-pc-windows-msvc/msvc	9m 59s
	1h 8m 42s

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