Stefan Walk wrote:
For the people who have said "I can not understand why this is a bad
thing":
http://en.wikipedia.org/wiki/Liskov_substitution_principle
so it is a bad thing when aiming for substitutability,
i lack to see an argument yet for substitutability being
a must have in all situations
(just as a normalized data model is not always the right
choice in database design ... it's something to aim for
but if it were enforced this would be BAD THING(tm))
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Hartmut Holzgraefe, Senior Support Engineer .
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