[towelguy]

    s1 = Symbol("cat");
    s2 = Symbol.for("cat");
    s3 = Symbol.for("cat");
    s1 == s2; // false
    s2 == s3; // true

You can still have Symbols outside the registry.

[artursapek]

That I understand. What I don't understand is why s2 and s3 shouldn't just be vanilla strings.