Why 'if 0' succeeds in Ruby

I agree with you. I am also used to this. nil should never == true, and
neither be == false. Every comparison with nil should just fail.

Every comparison with nil (except with itself) does fail.

“unless foo” is not a comparison of foo with false, it is exactly
equivalent to “if not foo”.

You seem to be recommending an SQL-style 3-value logic which is

For the second time so far: His statement is jargon, and is not to be
literally. His code sample showed what he meant!

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