No comparison without explicit casts is a valid design choice. I think Ada and Rust work that way, though I've never used either language and might be mistaken...
Yeah, there was some interpretation of the intent behind the comment on my part (cf "you probably want it to be a static type error").
How you view the claim itself depends on your thoughts about the level at which equality should operate (should type tags be considered part of a value's identity, is it about the bit representation, or the abstract value encoded by that representation, ...)
You're saying is that an 8-bit number can never be equal to a 16-bit number, or a 32-bit number, or a...
I hope you agree that's ridiculous.