mapbox/mapbox.js — pull request #732 by ubergesundheit (2014-04-11 22:42:54+00:00)
Title: Set defaults for min/max Zoom in L.mapbox.tileLayer

When overwriting TileLayer options from TileJSON the defaults of
min/max Zoom gets overwritten with `undefined` when not set in
TileJSON which causes the map to break.