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Query a sorted set representing a geospatial index to fetch members matching a
given maximum distance from an already existing member

@param [Array] args key, member, radius, unit(m|km|ft|mi)
@param ['asc', 'desc'] sort sort returned items from the nearest to the farthest or the farthest to the nearest relative to the center
@param [Integer] count limit the results to the first N matching items
@param ['WITHDIST', 'WITHCOORD', 'WITHHASH'] options to return additional information
@return [Array<String>] may be changed with `options`
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