Can someone explain this? I mean, the last result. Usually I can at least understand Javascript's or PHP's quirks. But this time I'm stumped.

JS null and undefined shenanigans

basically:

bigger an lesser comparison types convert null to zero, so is zero bigger or lesser than zero? no

== is fucky and to it null only equals undefined and undefined only equals null (and themselves), so no

is zero bigger than or equal to zero? yeah

Ugh, thanks, of course. Stupid brain.

I'm starting to think JS maintainers have a thing against mathematicians