323 - function clauses

You can now call 'def' on a function name multiple times. Each time the
instructions you provide are *prepended* to any existing instructions.

One important use for this is when you define a new type and need to
support it in all your generic methods. Now you can keep all those
extensions in one place, near the definition of the type.

To redefine a function, use 'def!'.

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