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In the execution this is an array access, but the logical definition is just a thin wrapper for nth:
Function:
(defun u32s$ai (stobjs::i u32arr$a) (declare (xargs :guard (and (u32arr$ap u32arr$a) (integerp stobjs::i) (<= 0 stobjs::i) (< stobjs::i (u32s$a-length u32arr$a))))) (ec-call (nfix (ec-call (nth stobjs::i u32arr$a)))))