Reference implementation for PEP 828 #2331

Job	Run time
aarch64-unknown-linux-gnu/gcc	7m 19s
x86_64-pc-windows-msvc/msvc-free-threading	4m 28s
x86_64-apple-darwin/clang	22m 20s
aarch64-apple-darwin/clang	9m 52s
x86_64-unknown-linux-gnu/gcc	9m 36s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 42s
x86_64-pc-windows-msvc/msvc	9m 34s
	1h 11m 51s

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