2010-03-28

1. Write shoulda tests for TypedMethod, TypedArray and TypedHash
2. Create sub-classes of TypedString: TypedMethod, TypedArray, TypedHash
   A TypedMethod should have a TypedArray as arguments, eventually with a TypedHash as last argument
3. Move list code from TypedString into TypedArray
4. Move hash code from TypedString into TypedHash