Hint
Symbols throw TypeError on implicit string coercion — a deliberate design to prevent accidental use as object keys when you meant to use strings.
const sym = Symbol('test');
console.log(typeof sym);
console.log(sym.toString());
console.log(sym.description);
console.log(sym + '');
console.log(Boolean(sym));symbol Symbol(test) test TypeError: Cannot convert a Symbol value to a string true
Explanation: typeof returns "symbol". .toString() explicitly converts: "Symbol(test)". .description gives just the label: "test". Implicit string coercion (+ "") throws TypeError — Symbols resist coercion. Boolean conversion: all Symbols are truthy.
Key Insight: Symbols throw TypeError on implicit string coercion — a deliberate design to prevent accidental use as object keys when you meant to use strings.