[jetako]

isNaN(null) == false; is the only wtf I can never remember to avoid, because I can't rationalize it no matter how hard I try.

Edit: I get it now. null coverts to 0

[alunny]

it's because of type conversion - null has the same value as 0 (as in `(+ null)`), so it is a number

[jetako]

Yea, what a weird mental block, not realizing null is equivalent to 0, even in math statements. I guess it's because null is not the same as 0 when converted to a String.