Compare strings when case is not important (using Unicode Case-folding).

// ignore ASCII case
let a = UniCase::new("foobar");
let b = UniCase::new("FOOBAR");

assert_eq!(a, b);

// using unicode case-folding
let c = UniCase::new("Maße")
let d = UniCase::new("MASSE");
assert_eq!(c, d);

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