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On Fri, May 6, 2016 at 11:46 AM, Roberto Ierusalimschy
<> wrote:
> - new semantics for empty matches ("Python rule")

After thinking about it for a few days, I'm going to argue that this
change flat-out does not belong in a bugfix release. It's not a bugfix
at all; it's a change in the behavior of a feature that, although it
is undocumented, is reasonably well-known enough that a
non-insignificant number of people and libraries may be reliant upon
the existing behavior, and is thus a backwards-incompatible change.

The very fact that someone needed to start a thread a few days ago
asking how to programmatically distinguish between 5.3.2 and the
proposed 5.3.3 is indicative of the fact that this will break people's
code, violating the trust that people have regarding bugfix releases
being backwards compatible.

Therefore, as a backwards-incompatible change, this feature should be
removed from the 5.3.3 release candidate and should be delayed until
5.4 or 6.0 (whichever the next version ends up being).

Thoughts on this?