@Override
        public String toString() {
            return "VariableAmount.BaseAndVariance(base=" + this.base + ", variance=" + this.variance + ")";
        }
Represents a base amount with a variance, the final amount will be the
base amount plus or minus a random amount between zero (inclusive) and
the variance (exclusive).
helper/src/main/java/me/lucko/helper/random/VariableAmount.java