function bind(func, thisArg) {
	      var bitmask = BIND_FLAG;
	      if (arguments.length > 2) {
	        var partials = baseSlice(arguments, 2),
	            holders = replaceHolders(partials, bind.placeholder);

	        bitmask |= PARTIAL_FLAG;
	      }
	      return createWrapper(func, bitmask, thisArg, partials, holders);
	    }
Creates a function that invokes `func` with the `this` binding of `thisArg`
and prepends any additional `_.bind` arguments to those provided to the
bound function.

The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
may be used as a placeholder for partially applied arguments.

**Note:** Unlike native `Function#bind` this method does not set the `length`
property of bound functions.

@static
@memberOf _
@category Function
@param {Function} func The function to bind.
@param {*} thisArg The `this` binding of `func`.
@param {...*} [args] The arguments to be partially applied.
@returns {Function} Returns the new bound function.
@example

var greet = function(greeting, punctuation) {
  return greeting + ' ' + this.user + punctuation;
};

var object = { 'user': 'fred' };

var bound = _.bind(greet, object, 'hi');
bound('!');
// => 'hi fred!'

// using placeholders
var bound = _.bind(greet, object, _, '!');
bound('hi');
// => 'hi fred!'