Using symbol for isLong

[srknzl]

It might be better to use javascript's symbols to validate if an object is long. By using a symbol, we can guarantee that the property indicating if an object is long cannot be accessed(since every symbol is unique).

[dcodeIO]

Makes me wonder how Object.getOwnPropertySymbols changes the equation.

[srknzl]

Might be possible, but It is much harder to modify a symbol key.