[defined]

I didn't know OS/X used the decimal prefixes, but that just means it's less true, not untrue. There are still many more systems out there that use the binary prefix. I imagine most *nix, and not sure about Windows. And RAM is still power of 2.

I don't think it's terribly user hostile to express sizes as powers of two when you work with these kinds of numbers for a living, especially when it's near the bare metal (Erlang binary data type FTW!)

But I do think it's user hostile to have two different units depending on what you're looking at. If it were all decimal or all binary, it would be much easier.