[Twisted-Python] Backward incompatible fixes to backward incompatible changes

[Jean-Paul Calderone]

On Thu, Apr 25, 2019 at 12:52 PM Jean-Paul Calderone <
exarkun at twistedmatrix.com> wrote:

> Hello all,
>
> I'd like to discuss the project policy/process for dealing with incorrect
> backward incompatibilities that end up released.
>

Considering the lack of interest in the topic, I'm going to suppose that
there is no policy and the decision is made case-by-case.  In the case I
referenced, I'm going to approve the change in behavior as "compatible" by
on the grounds that it restores the original behavior.

Jean-Paul


> As a case study, we could look at
> https://twistedmatrix.com/trac/ticket/9410
> <https://twistedmatrix.com/trac/ticket/9410#comment:17> /
> https://github.com/twisted/twisted/pull/1106
>
> In Twisted 16.3.0 the behavior of Request.write was changed so that it
> raises an AttributeError if called after the connection has closed.  Prior
> to that release, it silently did nothing in that case.
>
> Now, three years later, we have a PR which proposed restoring the behavior
> of silently ignoring the write to a closed connection.
>
> The original change was incompatible.  The new change is incompatible.
> What should win out?
>
> Jean-Paul
>
>
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