Constant kvarn::prelude::compact_str::core::f64::consts::FRAC_1_SQRT_2

pub const FRAC_1_SQRT_2: f64 = 0.707106781186547524400844362104849039f64; // 0.70710678118654757f64

Available on non-crate feature miri-test-libstd only.

1/sqrt(2)