In https://twistedmatrix.com/trac/changeset/45163 
twisted.internet.application.service.Service to be a new-style class.  Just to 
remind everyone, converting an old-style class to a new-style class is an 
incompatible change, and reviewers should look for this.

We discovered this because this change breaks https://github.com/twisted/axiom, 
and probably it breaks other packages as well, since lots of things inherit 
from Service.  So please remain diligent about looking for this in future 
changes.  Now that it's been changed, reverting it in 15.4 would be another 
incompatible change, so we probably won't do that, but please keep an eye out 
in the future.

-glyph

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