mapbox/markers.js — pull request #53 by Swatinem (2013-03-14 18:15:55+00:00)
Title: Only clear the markers cache for markers created by `features()`

This fixes the problem that tooltips are themselves just markers but don’t share
the same `data` and are not added to the marker cache at all.
See https://github.com/mapbox/markers.js/pull/52#issuecomment-14909544