Released v15.2 * Fix an error where the arbitary specifier (``===``) was not correctly allowing pre-releases when it was being used. * Expose the specifier and version parts through properties on the ``Specifier`` classes. * Allow iterating over the ``SpecifierSet`` to get access to all of the ``Specifier`` instances. * Allow testing if a version is contained within a specifier via the ``in`` operator.