title: SimpleInjector Unbind/Rebind
body: <p>I have a core set of libraries that are delivered and work "out of the box". Meaning that the services are all wired up inside. I would like to have the ability to modify the core library (without modifying the library itself).</p>
  
  <p>With that said, is there an Unbind/Rebind support in SimpleInjector? I didn't see any publicly visible methods on the container. I did find a private dictionary of registrations that I can get to with reflection. </p>
  
  <p>Does anyone see a reason why I can't remove items from this private dictionary (to then re-add) at runtime with reflection? Is there a method I am missing?</p>