function next() {
		i += 1;
		if ( FLG || i >= len ) {
			return {
				'done': true
			};
		}
		return {
			'value': [ i, Boolean( buf[ i ] ) ],
			'done': false
		};
	}
Returns an iterator protocol-compliant object containing the next iterated value.

@private
@returns {Object} iterator protocol-compliant object