[issue19232] Speed up _decimal import

[Eric V. Smith]

Eric V. Smith added the comment:

Remember that one reason for importing the C version at the bottom of the python version is so that alternate implementations (PyPy, IronPython, Jython) could provide partial versions of the C (or equivalent) versions. By importing after the Python version, the alternate implementation could continue to use parts of the Python code.

I think the impact on alternate implementations needs to be considered before we start rearchitecting these imports.

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nosy: +eric.smith

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