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    Good parting point.

    Why is it bad that you can redefine random parts of the system in smalltalk? This seems like a lot of power tastefully expressed.

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      At the very least, it makes composability difficult. (like Ruby programmers who overzealously monkeypatch.) Without a way to scope such changes, you shift the ground beneath all code, including libraries you might want to use.

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        I’m a fan of the Lua approach, where you can redefine random parts of a system, but only in a scoped way (for instance, you could load an untrusted library with a stubbed-out filesystem that reads from memory).