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You can have new tools without breaking the old ones. We didn't
have to change BCPL to get B, or B to get C, or C to get D or C++.
This really is a very simple point, but perhaps a simple analogy
will help to clarify it. You don't throw out your 3/4" just
because you've bought a 19mm. There is room for both in the
toolbox, and why write 3/4" on your new spanner? It /isn't/ a
3/4" spanner even though it's very like it, so why pretend otherwise?
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