static Jsi_RC jsi_ArrayJoinCmd(Jsi_Interp *interp, Jsi_Value *args, Jsi_Value *_this,
    Jsi_Value **ret, Jsi_Func *funcPtr)
{
    if (_this->vt != JSI_VT_OBJECT || !Jsi_ObjIsArray(interp, _this->d.obj))
        return Jsi_LogError("expected array object");
    const char *jstr = "";
    int argc, curlen;
    Jsi_DString dStr = {};

    curlen = Jsi_ObjGetLength(interp, _this->d.obj);
    if (curlen == 0) {
        goto bail;
    }

    if (Jsi_ValueGetLength(interp, args) >= 1) {
        Jsi_Value *sc = Jsi_ValueArrayIndex(interp, args, 0);
        if (sc != NULL)
            jstr = Jsi_ValueToString(interp, sc, NULL);
    }
    
    if (0 == (argc=Jsi_ObjGetLength(interp, _this->d.obj))) {
        goto bail;
    }
    int i;
    for (i = 0; i < argc; ++i) {
        const char *cp;
        Jsi_Value *ov = Jsi_ValueArrayIndex(interp, _this, i);
        if (!ov) {
            /* TODO: are NULL args ok? */ 
            continue;
            cp = "";
        } else
            cp = Jsi_ValueToString(interp, ov, NULL);
        if (i && jstr[0])
            Jsi_DSAppend(&dStr, jstr, NULL);
        Jsi_DSAppend(&dStr, cp, NULL);
    }
    
    Jsi_ValueMakeStringDup(interp, ret, Jsi_DSValue(&dStr));
    Jsi_DSFree(&dStr);
    return JSI_OK;
bail:
    Jsi_ValueMakeStringDup(interp, ret, "");
    return JSI_OK;        
}
The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control.