// List of a few values that are not objects.
var SOME_PRIMITIVE_VALUES = [
    undefined, null,
    false,
    -Infinity, -1.6e99, -1, -0, 0, Math.pow(2, -1074), 1, 4294967295,
    Number.MAX_SAFE_INTEGER, Number.MAX_SAFE_INTEGER + 1, 1.6e99, Infinity, NaN,
    "", "Phaedo",
    Symbol(), Symbol("iterator"), Symbol.for("iterator"), Symbol.iterator
];