Rails 2.0 Compatible with Previous Prototype & Scriptaculous?

Is Rails 2.0 compatible with Prototype 1.5.1 & Scriptaculous 1.7?

We're preparing to upgrade a large Rails app to 2.0 RC1. Our app makes
extensive use of methods in PrototypeHelper and ScriptaculousHelper.
It also uses other Javascript libraries (e.g., Control.Modal,
Control.Tabs) that are tied to Prototype version 1.5.1.

Ideally, we would upgrade Rails to 2.0, but stick with our current
versions of Prototype (1.5.1) and Scriptaculous (1.7) for now. Would
that work out OK? Or does Rails 2.0 require the current releases of
these libraries?

Michael