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#' FeatureCollection
#'
#' A GeoJSON object with the type "FeatureCollection" is a feature collection
#' object. An object of type "FeatureCollection" must have a member with the
#' name "features". The value corresponding to "features" is an array. Each
#' element in the array is a feature object as defined above.
#'
#' @name FeatureCollection
#' @family geo types
#' @examples
#' '{
#' "type": "FeatureCollection",
#' "features": [
#' {
#' "type": "Feature",
#' "properties": {
#' "population": 200
#' },
#' "geometry": {
#' "type": "Point",
#' "coordinates": [-112.0372, 46.608058]
#' }
#' }
#' ]
#' }'
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