This change is needed to address a bug in older versions of PHP 5.3
affecting inheritance (see https://bugs.php.net/bug.php?id=66818).
We will most likely resort to a workaround in v1.0 to stick with the
currently required minimum version of PHP (>= 5.3.2), but v1.1 will
surely require => 5.3.9.
[ci skip]
Let's allow people to install predis using "1.0.x@dev", "~1.0@dev", or any other valid version constraint rather than typing "dev-master" which is really horrible.
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