[typing] Tracer: add missing __round__ and __reversed__ methods #12428
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These are missing, which means that when the
typing.Array
abstract base class (#12049) is applied, then instantiating a Tracer leads to an error. This also meant that previously usinground(x)
withinjit
was unsupported (althoughreversed(x)
was supported via the fallback to slicing).