code: static boolean isJavaAssignable( Class lhsType, Class rhsType ) {
          return isJavaBaseAssignable( lhsType, rhsType )
              || isJavaBoxTypesAssignable( lhsType, rhsType );
      }
docs: Test if a conversion of the rhsType type to the lhsType type is legal via
  standard Java assignment conversion rules (i.e. without a cast).
  The rules include Java 5 autoboxing/unboxing.
  <p/>
  
  For Java primitive TYPE classes this method takes primitive promotion
  into account.  The ordinary Class.isAssignableFrom() does not take
  primitive promotion conversions into account.  Note that Java allows
  additional assignments without a cast in combination with variable
  declarations and array allocations.  Those are handled elsewhere
  (maybe should be here with a flag?)
  <p/>
  This class accepts a null rhsType type indicating that the rhsType was the
  value Primitive.NULL and allows it to be assigned to any reference lhsType
  type (non primitive).
  <p/>
  
  Note that the getAssignableForm() method is the primary bsh method for
  checking assignability.  It adds additional bsh conversions, etc.
  
  @see #isBshAssignable( Class, Class )
  @param lhsType assigning from rhsType to lhsType
  @param rhsType assigning from rhsType to lhsType