Is there a mechanism to disinherit an inherited method? Such that $object->can( $disinherited_method ) can't?

Conditions:

• Package A implements methods a1( ), a2( ), a3( ).
• Package B implements methods b1( ), b2( ).
• Package B is derived from base package A (ie. @B::ISA = qw( A );)
• I want Package B to implement methods a1( ), a2( ), b1( ), and b2( ). I don't want Package B to implement method a3( ).

my $example = new B;
if( $example->can( "a3" ) {
  $example->a3(); # @$*&%! Still there.
} else {
  print "Successful disinheritence!\n";
}
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I've tried messing with Exporter in a bunch of ways, after reading the Camel 3rd ed. Unfortunately I glossed over the part on p889 until after I made a bunch of failed examples. I've tried undef( &A::a3 ), only to be greeted with an error I've not seen before (something like undefined subroutine a3() called at line...). Please, no recommendations to refactor my classes.

Much thanks in advance,
- m.

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