🌟object -> primitive conversion
JS ⟩ value ⟩ type ⟩ conversion ⟩ object -> primitive
JS spec defines 3 algorithms for object -> primitive conversion：
prefer-string：preferring a string (if conversion is possible)
prefer-number：preferring a number (if conversion is possible)
no-preference：classes choose their own preference.
⬇️ object -> primitive algorithms are involved in：
⛔ object -> primitive algorithms may result in TypeError❗
Object.prototype.toString() - object to string.
Object.prototype.valueOf() - object to (primitive) value, if exists.
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