Some small nits to fix:

1. C has it’s own undefined behavior.

2. JS has confusing behavior, not undefined behavior. Its specs are well defined and backwards compatible to a fault, making things harder to learn if you don’t learn the history of the language.

3. Problems with both should be avoided by learning and using standard practices. (Don’t pretend C is object oriented, always use === instead of == in js, etc…)

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In complete agreement:

1. Result types are awesome, all future languages should be designed around them.