FeatureCollection

[tibotiber]

Hi, I've had to create an interface for FeatureCollection in my code as it includes a name which geojson's one doesn't include. Would you be interested to add an interface for this? I could open a small PR if there is interest.

interface ImdfFeatureCollection<T> {
  name: string
  type: 'FeatureCollection'
  features: T[]
}

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