[perl #48182] [TODO] [amber] Reject out of range values in item()

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# New Ticket Created by  Paul Cochrane 
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In languages/amber/lib/kernel/pmc/amber_array.pmc:last() there is the
todo item:

/* XXX reject out-of-range values (0, or > count, or < -count) */

So, out of range values need to be detected and properly handled in this
method.