[Twisted-Python] incompatible change - need revert before release

[Glyph Lefkowitz]

Tom Prince discovered a regression on https://twistedmatrix.com/trac/ticket/7016#comment:14 <https://twistedmatrix.com/trac/ticket/7016#comment:14> - I think that this was introduced after 15.4, so it needs to be rolled back (or fixed, if someone can get to it before the revert) in 15.5.

-glyph

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