Checks if `value` is classified as a `Function` object.

@static
@memberOf _
@since 0.1.0
@category Lang
@param {*} value The value to check.
@returns {boolean} Returns `true` if `value` is a function, else `false`.
@example

_.isFunction(_);
// => true

_.isFunction(/abc/);
// => false
function isFunction$6(value) {
	  if (!isObject_1(value)) {
	    return false;
	  }
	  // The use of `Object#toString` avoids issues with the `typeof` operator
	  // in Safari 9 which returns 'object' for typed arrays and other constructors.
	  var tag = _baseGetTag(value);
	  return tag == funcTag$6 || tag == genTag$6 || tag == asyncTag$1 || tag == proxyTag$1;
	}