Why did this not post the first time... oh yeah...
Using the F3 key was always pretty much useless, though you do get that fancy graph of your cpu/graphics use (whatever it is, I call it a lag-o-meter because when it's spiking & red, expect lag) but now the F3 display shows your position down to 15 decimal places.
Pretty neat, and useful, though having to hold the F3 key isn't fun while trying to walk around, and there are probably a few mods that already show the same info, like MrMessiah's simple map.
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To tell them how to live is to prevent them living.