function accumulator( x ) {
		if ( arguments.length === 0 ) {
			return min();
		}
		return min( abs( x ) );
	}
If provided a value, the accumulator function returns an updated minimum absolute value. If not provided a value, the accumulator function returns the current minimum absolute value.

@private
@param {number} [x] - new value
@returns {(number|null)} minimum absolute value or null