If water is streaming down in mid-air, you can swim up just as fast as if its in sea out of 100% source blocks (which do not stream down). Only if theres blocks aside the water streaming down, it will slow you down.
This doesnt make sense.
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but it just doesnt make sense, hence why I posted it 🙂
Is this still a concern in the current Minecraft version 1.7.2 / Launcher version 1.3.4 ? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Yes, this bug still occurs in this version of the game.

Is this still a concern in the current Minecraft version 1.7.4 / Launcher version 1.3.8 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Can confirm in 20w48a.
Its just minecraft physics... Works on every operating system.