Replaced -[MGLMapView style] with a property. Keep the MGLStyle object around for the lifetime of the style.
Bracket changes to layers in willChange and didChange calls. The built-in point annotation layer is added after the style is finished loading but before the map is finished loading. Cause a second wave of change notifications to go out, about both sources and layers. Issue change notifications for style layers when shape annotations are added or removed.
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