Restore ?field syntax

std/js/lib/Object.hx

@@ -284,28 +284,28 @@ typedef ObjectPropertyDescriptor<TProp> = {
 		The value associated with the property.
 		Can be any valid JavaScript value (number, object, function, etc).
 	**/
-	@:optional var value:TProp;
+	var ?value:TProp;
 
 	/**
 		`true` if and only if the type of this property descriptor may be
 		changed and if the property may be deleted from the corresponding object.
 		Defaults to `false`.
 	**/
-	@:optional var configurable:Bool;
+	var ?configurable:Bool;
 
 	/**
 		`true` if and only if this property shows up during enumeration of the
 		properties on the corresponding object.
 		Defaults to `false`.
 	**/
-	@:optional var enumerable:Bool;
+	var ?enumerable:Bool;
 
 	/**
 		`true` if and only if the value associated with the property may be
 		changed with an assignment operator.
 		Defaults to `false`.
 	**/
-	@:optional var writable:Bool;
+	var ?writable:Bool;
 
 	/**
 		A function which serves as a getter for the property, or `undefined` if
@@ -315,15 +315,15 @@ typedef ObjectPropertyDescriptor<TProp> = {
 		property is defined due to inheritance).
 		The return value will be used as the value of the property.
 	**/
-	@:optional var get:Void->TProp;
+	var ?get:Void->TProp;
 
 	/**
 		A function which serves as a setter for the property, or undefined if
 		there is no setter. When the property is assigned to, this function
 		is called with one argument (the value being assigned to the property)
 		and with `this` set to the object through which the property is assigned.
 	**/
-	@:optional var set:TProp->Void;
+	var ?set:TProp->Void;
 }
 
 /**