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I'm a little unsure what to do with the API, see also #15237:
 1) I'm not too fond of the Capsule method, especially because
 it *seems* possible to get at the symbols directly on Linux
 and Windows (provided that they aren't static of course).
 2) I would not like to spend time on it if we go ahead and
 make decimal a builtin (double effort).
 3) It's not clear whether users would not be served better by
 using functions from libmpdec directly (much faster,
 probably less error handling).
For 3) I've attached a draft that illustrates the issue.