Function lim

lim(
    f: (x: number) => number,
    x: number,
    h?: number,
    discontinuity_cutoff?: number,
): number
Take the limit of a function. A return value of NaN indicates that no limit exists either due to a discontinuity or imaginary value.
Parameters
- f: (x: number) => number
  Function f(x)
- x: number
  The x-value where to take the limit
- h: number = 1e-3
  The approach distance
- discontinuity_cutoff: number = 1
  The discontinuity cutoff
Returns number
lim(f(x->x))
Example
```
const y = SMath.lim(Math.log, 0); // -Infinity
```