JIT

+ adapt dec_from_long() to use PEP 757 #231

Job	Run time
Interpreter (Debug)	7m 40s
Free-Threaded (Debug) (19)	11m 43s
i686-pc-windows-msvc/msvc (Debug)	18m 42s
i686-pc-windows-msvc/msvc (Release)	11m 14s
x86_64-pc-windows-msvc/msvc (Debug)	17m 25s
x86_64-pc-windows-msvc/msvc (Release)	11m 40s
aarch64-pc-windows-msvc/msvc (Debug)	5m 4s
aarch64-pc-windows-msvc/msvc (Release)	6m 21s
x86_64-apple-darwin/clang (Debug)	11m 7s
x86_64-apple-darwin/clang (Release)	7m 18s
aarch64-apple-darwin/clang (Debug)	8m 52s
aarch64-apple-darwin/clang (Release)	8m 33s
x86_64-unknown-linux-gnu/gcc (Debug)	9m 54s
x86_64-unknown-linux-gnu/gcc (Release)	5m 46s
aarch64-unknown-linux-gnu/gcc (Debug)	8s
aarch64-unknown-linux-gnu/gcc (Release)	9s
	2h 21m 36s

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