`[1, 'x', true].toLocaleString()` gave `[object Number],[object String],[object Boolean]`
because the wrappers' prototypes have no `toString` on this branch and the lookup reached
Object.prototype.toString. Object.prototype.toLocaleString now returns the string form of
the object's primitive value when `toString` is not found on the object or on its chain up
to its standard prototype. A `toString` on the object or that prototype is still called.
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