[2019] AOE Radius should have two decimal places

Locations are absolutely integers, and that's entirely normal. I'd be very surprised if any game like this tried to use floating point math for that, because it's entirely unecessary, makes some very common calcualtions less efficent (espescially in pathfinding, which is a bottleneck in a game with this many entities doing it at once), and is extremely liable to cause desync, because floating point calculations can result in different answers when run on different processors, causing disagreements between the client and server.

Integer locations on a small grid are better in pretty much every way for the game logic (a continuous/floating-point location can be layered on top for display purposes, avoiding any "jaggedness" of movement - we do this).

This does not technically mean that modifying radius values by less than one would have no difference, though, since areas are actual circles and thus the extra fractional parts could be the difference between including or excluding certain locations at certain angles around the circle. But such small differences would not be practically noticable in actual play anyway, so I would suspect the benefit from reworking all the relevant systems would not justify the cost.

For the record, both Fireball and Molten Strike projectile explosions have a radius of 9. Monster skills go as low as 4 (and may be relevant to players via spectres, etc).