The fact that the most trivial floating-point addition of 0.1 + 0.2 = 0.300000000000004 was insufficient to make this seem HUMAN-nondeterministic to you? (I mean sure, if you thoroughly understood the entire spec, you might not be surprised by this result, but many people would be! Otherwise the original post and website would not exist, no?)

It’s kind of a hallmark of bad design when you have to go into a long-winded explanation of why even trivial use-case examples have “surprising” results.