openlayers/ol3 — pull request #1090 by tschaub (2013-10-02 22:42:17+00:00)
Title: Symbolizer zIndex

This adds support for a `zIndex` property on symbolizers. By default, symbolizers have a `zIndex` of 0. The `zIndex` value in symbolizer literals is considered when determining equality. Before rendering, features with equivalent symbolizers are grouped.

In a separate pull request, feature groups will be sorted by symbolizer `zIndex` before rendering.