Function immutable

Wrapper for bipolar-based values. Immutable. All functions will clamp to keep it in legal range.

let v = immutable(); // Starts with 0 by default
v = v.add(0.1);      // v.value is 0.1
v = v.inverse();     // v.value is -0.1
v = v.multiply(0.2); // v.value is -0.02

v = immutable(1);
v = v.towardZero(0.1); // 0.9
v = v.interpolate(0.1, 1);
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Wrapped values can be coerced into number:

const v = immutable(1);
const x = +v+10;
// x = 11
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