[issue43009] Port curses capi pointer array to a struct

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

> The _decimal API is also just an array of pointers. Should we change that to a struct as well?

+1. IMHO, structure is more directly than pointer array. And there haven't exposing this pointer array to users(no backward compatibility).

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<https://bugs.python.org/issue43009>
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