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I'm fine with an array type that supports this, but not as the default. I've been bitten in the past by code that ran error-free while giving incorrect output due to this feature suddenly making the indexing valid. I'd prefer it to be opt-in somehow so that the default behavior for negatives is invalid, not silently wrong yet valid behavior.

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Matlab has the opposite where your syntactically valid but mysteriously non-working code suddenly has a large array.

EDIT: On the other hand, I think Matlab's array(end - number) indexing syntax is a good compromise of convenience and less error prone explicitness.

You can also overload end in Matlab for your custom classes as it's actually a method.

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