function iterSquaresSeq( options ) {
	var opts;
	var iter;
	var FLG;
	var err;
	var i;

	opts = {
		'iter': MAX_ITER
	};
	if ( arguments.length ) {
		err = validate( opts, options );
		if ( err ) {
			throw err;
		}
	}
	i = -1;

	// Create an iterator protocol-compliant object:
	iter = {};
	setReadOnly( iter, 'next', next );
	setReadOnly( iter, 'return', end );

	// If an environment supports `Symbol.iterator`, make the iterator iterable:
	if ( iteratorSymbol ) {
		setReadOnly( iter, iteratorSymbol, factory );
	}
	return iter;

	/**
	* Returns an iterator protocol-compliant object containing the next iterated value.
	*
	* @private
	* @returns {Object} iterator protocol-compliant object
	*/
	function next() {
		i += 1;
		if ( FLG || i >= opts.iter ) {
			return {
				'done': true
			};
		}
		return {
			'value': i * i,
			'done': false
		};
	}

	/**
	* Finishes an iterator.
	*
	* @private
	* @param {*} [value] - value to return
	* @returns {Object} iterator protocol-compliant object
	*/
	function end( value ) {
		FLG = true;
		if ( arguments.length ) {
			return {
				'value': value,
				'done': true
			};
		}
		return {
			'done': true
		};
	}

	/**
	* Returns a new iterator.
	*
	* @private
	* @returns {Iterator} iterator
	*/
	function factory() {
		return iterSquaresSeq( opts );
	}
}
Returns an iterator which generates a sequence of squares.

## Notes

-   If an environment supports `Symbol.iterator`, the returned iterator is iterable.

@param {Options} [options] - function options
@param {NonNegativeInteger} [options.iter=94906265] - number of iterations
@throws {TypeError} options argument must be an object
@throws {TypeError} must provide valid options
@returns {Iterator} iterator

@example
var iter = iterSquaresSeq();

var v = iter.next().value;
// returns 0

v = iter.next().value;
// returns 1

v = iter.next().value;
// returns 4

// ...