How is casting and coersion handled with expressions involving mixed low
and high level types?

For example, what is the output of this?

    my Int  $ten = 10;
    my int4 $a   = 0;
    my int4 $b;

    $b = ($a + 2.4 * $ten) / 4;
    say $b;

The answers to the above questions may alter my view on the proper
handling of overflow during casting/coersion.


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