Example: <MGLStyle: 0x60800001e0a0; name = "Mapbox Dark", URL = "mapbox://styles/mapbox/dark-v9"> - Adds an internal `URL` property.
Example: <MGLStyle: 0x60800001e0a0; name = "Mapbox Dark", URL = "mapbox://styles/mapbox/dark-v9"> - Adds an internal `URL` property.