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        switch (SvTYPE(sv)) {
        /* [snip] */
        case SVt_RV: /* [snip IV, PV, etc., all falling through] */
...
        case SVt_PVAV:  s = "ARRAY";            break;
        case SVt_PVHV:  s = "HASH";         break;
        /* [snip CODE etc.] */