function isMatch(object, source, customizer, thisArg) {
	      var props = keys(source),
	          length = props.length;

	      customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 3);
	      if (!customizer && length == 1) {
	        var key = props[0],
	            value = source[key];

	        if (isStrictComparable(value)) {
	          return object != null && value === object[key] && hasOwnProperty.call(object, key);
	        }
	      }
	      var values = Array(length),
	          strictCompareFlags = Array(length);

	      while (length--) {
	        value = values[length] = source[props[length]];
	        strictCompareFlags[length] = isStrictComparable(value);
	      }
	      return baseIsMatch(object, props, values, strictCompareFlags, customizer);
	    }
Performs a deep comparison between `object` and `source` to determine if
`object` contains equivalent property values. If `customizer` is provided
it is invoked to compare values. If `customizer` returns `undefined`
comparisons are handled by the method instead. The `customizer` is bound
to `thisArg` and invoked with three arguments; (value, other, index|key).

**Note:** This method supports comparing properties of arrays, booleans,
`Date` objects, numbers, `Object` objects, regexes, and strings. Functions
and DOM nodes are **not** supported. Provide a customizer function to extend
support for comparing other values.

@static
@memberOf _
@category Lang
@param {Object} source The object to inspect.
@param {Object} source The object of property values to match.
@param {Function} [customizer] The function to customize comparing values.
@param {*} [thisArg] The `this` binding of `customizer`.
@returns {boolean} Returns `true` if `object` is a match, else `false`.
@example

var object = { 'user': 'fred', 'age': 40 };

_.isMatch(object, { 'age': 40 });
// => true

_.isMatch(object, { 'age': 36 });
// => false

// using a customizer callback
var object = { 'greeting': 'hello' };
var source = { 'greeting': 'hi' };

_.isMatch(object, source, function(value, other) {
  return _.every([value, other], RegExp.prototype.test, /^h(?:i|ello)$/) || undefined;
});
// => true