[feature: feature/baseSum-zero] Consider 1 undefined, null, false #5945
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as-is
_.sum([undefined]); // undefined
_.sum(undefined); // 0
_.sum([1, undefined]); // 1
_.sum([null]); // null
_.sum([1, null]); // 1
_.sum(null); // 0
_.sum([false]); // false
_.sum([1, false]); // 1
_.sum(false); // 0
to-be
_.sum([undefined]); // 0
_.sum([null]); // 0
_.sum([false]); // 0