Trying to get my mind around why the private() function is necessary here. 
I fail to understand the comment provided

type Geometry interface {
  GeoJSONType() string
  Dimensions() int // e.g. 0d, 1d, 2d
  Bound() Bound

  // requiring because sub package type switch over all possible types.
  private()
}

https://github.com/paulmach/orb/blob/master/geometry.go#L10

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