[issue44977] Deprecate delegation of int to __trunc__?

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> This decouples int from __trunc__ and leaves __trunc__ as simply the support for the math.trunc function.

Argh; copy and paste fail - I left out the crucial line.

I propose deprecating the delegation of int to __trunc__: calls to int(a) where type(a) implements __trunc__ but not __int__ or __index__ would raise a DeprecationWarning, and at some point in the future int(a) would become a TypeError.

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