Ensure All Builtin Functions Throw an Error when Null Input, unless Null input is allowed

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I'd like to push back on this one. Using a strongly typed functional language as a base, null should not be an allowed input to any function, since it does not match a ZType. I'd suggest that we catch null as a bad argument and throw a Z5 rather than gracefully fail within the builtin itself.

I can't find any evidence that functions can still receive null inputs; our argument validation should now catch any such cases. We can close this.