Hey.

Just to add some random feedbacks and caveats of my knowledge and experience about GeoJSON, maybe could help, and lead to improvements in the future.

The types field should respect case (and is camel cased)
A Feature is something in the shape {type: 'Feature', properties: {}, geometry: <Geometry>}
- type, properties (don't forget it) and geometry are mandatory
A Geometry is something in the shape {type: <GeometryType>, coordinates: []} OR {type: 'GeometryCollection', geometries: [Geometry]}
- There is a trick here, and this library should be concerned about this : GeometryCollection is a valid geometry, and thus changes the shape of the root Geometry object...
- I don't know if a GeometryCollection can be a geometry child of another GeometryCollection, but that's worth checking it
About coordinates, they are separated in "rings" logic
- A Polygon coordinates member is in the shape
```
[ // <= Array of 'rings'
  [ // Single outer 'ring'. It MUST be counter-clockwise
    [lng, lat], [lng, lat], [...] // Coordinates serie MUST have last === first
  ],
  [ // Inner 'ring' (hole). It MUST be clockwise
    [lng, lat], [lng, lat], [...] // Coordinates serie MUST have last === first
  ],
  [ // Another inner 'ring' (hole). It MUST be clockwise
    [lng, lat], [lng, lat], [...] // Coordinates serie MUST have last === first
  ]
]
```
- (I don't know if a "hole" (inner ring) can contain an "island". But that's worth checking...)
- A MultiPolygon coordinates member is an array of Polygon coordinates member
- A Position (coordinates couple) contains at least lng and lat in this order, but is not limited to this length, and could include, eg., elevation as a 3rd member ([lng, lat, elevation])
- Any GeoJSON member can include a srs (or crs, can't remember) member, which represent the projection of the data. The implicit projection when not provided is WGS84 (=== EPSG:4326)

Some useful stuff :

GeoJSON comments #7

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