Moving an Plane via numerical input to transform box alters it's rotation degree value slightly

Using latest Unity 5.3.3, I have a simple setup with some wall prefabs (a reduced from 1x1x1 to 0.1x0.1x0.25 scale, aka 1x1x2.5 units, a vertical wall strip so I can operate using the tiling texture without mucking around with many different tiled scaled material sets, this is just placeholder right now so performance is not yet a priority)just a plane with material and rotated 90 degrees so it is vertical. I drag it into the scene. I type something in for it's X position in the transform toolbar. the rotation value becomes 89.98019. this makes it extremely hard to work with 5.3.3, am I missing something? all I found via searching is that this issue is fixed in the 5.4 beta 1, but I'd rather not risk losing schoolwork due to general instability of betas.

How soon is this issue going to be rectified in a full stable build, and can I use a 5.3 project in an older 5.2 unity version somehow in the mean time? I tried searching for answers on that but all I get is topics relating to upgrading a project to a new version.