Allow plain negative numbers

[linuxrider]

str() converts minus - to unicode \u2212 which prevents the regex to match. This is fixed by replacing it again with -.

[ChHecker]

Could you provide an example that doesn't work? E.g. #num("-2.5") works perfectly for me.

[linuxrider]

If you do calculations or use variables it works for positive numbers but not for negative numbers. The proposed change allows to directly use numbers as is and not in a string, which enhances convenience for the user.

#import "@preview/unify:0.4.3": num
#let x = -2
#let y = 3

// #num(x) // does not work
// #num(str(x)) // does not work

#num(y) // works

#num(str(y)) // works

#num(calc.exp(1)) // works

// #num(-calc.exp(1)) // does not work

[ChHecker]

Thank you for your contribution!