Slightly pedantic, but it's a pain when designing UIs - there's a bug that's been hanging around since 3.15.
Basically, if typing in the exact width and/or height of a circle or ellipse shape, the typed value will have 1 added to it.
To replicate (v3.17)
1. Draw a circle or ellipse onto a panel
2. Select the object and type a number into the X or Y value for the 'Size' attribute
3. Type an integer (e.g., 32), press Enter and once the field loses focus you'll see 1 has been added to the value (e.g., 33)
Very odd, although very minor and easy to workaround.