pub fn ceiling_fibonacci_val(x: f64) -> f64
Smallest Fibonacci number (1, 2, 3, 5, 8, …) that is >= x; 1.0 for x <= 1. Assumes positive_finite(x).
1, 2, 3, 5, 8, …
>= x
1.0
x <= 1
positive_finite(x)