Some small nits to fix:
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C has it's own undefined behavior.
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JS has confusing behavior, not undefined behavior. Its specs are well defined and backwards compatible to a fault, making some things unintuitive and harder to learn if you don't learn the history of the language.
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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...)
In complete agreement:
- Result types are awesome, all future languages should be designed around them.