word.

Some examples of how water is broken:

Overlapping water of different fluids can lead to lingering water flows when no matching source fluid block is present.
https://youtu.be/JOxSFg-u-Rs

We want sources that are closer to be able replace other water flows.
An example case where the flows are parallel:
https://youtu.be/JOxSFg-u-Rs

Design notes on fluid interactions:
flowing water should not ever replace a source block

flowing waters from alternate fluids should equalize their flows against one another, similar to how fluids of the same type interact.

Discussed order on when water should replace other water:
Fluid flow strength > fluid density > first present > alphabetical name

Fluids should equalize like this when on the same level:

But currently if you place one or the other first, you get this: