function isPrototype(value) {
	  var Ctor = value && value.constructor,
	      proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;
	
	  return value === proto;
	}
Checks if `value` is likely a prototype object.

@private
@param {*} value The value to check.
@returns {boolean} Returns `true` if `value` is a prototype, else `false`.