code: function validatePosition(value) {
  	if (
  		!_.isArray(value) ||
  		value.length !== 2 ||
  		typeof value[0] !== 'number' ||
  		typeof value[1] !== 'number'
  	) {
  		throw new FieldError('invalid_type', 'Must be array in form [ long, lat ]');
  	}
  	if (value[0] < -180 || value[0] > 180) {
  		throw new FieldError('invalid_format', 'Longitude must be between -180 and 180');
  	}
  	if (value[1] < -90 || value[1] > 90) {
  		throw new FieldError('invalid_format', 'Latitude must be between -90 and 90');
  	}
  }
docs: Validates a [ long, lat ] value