If they work in high level language that hides all that behind "number", who cares. How floating point numbers are represented is interesting trivia, but hardly useful in most situations. In general, I would expect people to remember things that are used often and be able to learn the rest fast (e.g. understand concepts and have enough knowledge to make further learning easy).

The rest is fluff and hidden cultural test: "Do you have the same history as I do?"