4.3.85-beta has math! You can do simple things like 300/15 or use full calculator-like features, like parenthesis like 5*(10-2). There are even functions like ln for length and constants like pi, eg ln(pi^2-1).
We still support the +, +-, *, / prefixes for modifying the current value, but the +- prefix was always weird, so now we also have more consistent prefixes: +=, -=, *=, /=. For example, *=10 or *=20/3 changes the current value.
Also those prefixes now work correctly when multiple items are selected, so you can do math on many different current values at once. Previously they would all get the same value.
