in lib/facebook_ads/ad_objects/server_side/util.rb [38:48]
def self.normalize_array(input_array, field_type)
return nil unless input_array.is_a?(Enumerable)
return nil if input_array.empty?
return nil unless input_array.all?{|value| value.is_a?(String)}
input_array
.map{|value| self.normalize(value, field_type)}
.to_set
.to_a
end