static Jsi_RC jsi_ArrayFillCmd(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");
    Jsi_RC rc = JSI_OK;
    int istart = 0, iend, n, nsiz;
    Jsi_Number nstart = 0, nend = 0; // TODO: merge with code in ArraySliceCmd.
    Jsi_Value *value = Jsi_ValueArrayIndex(interp, args, 0),
        *start = Jsi_ValueArrayIndex(interp, args, 1),
        *end = Jsi_ValueArrayIndex(interp, args, 2);
    Jsi_Obj *obj = _this->d.obj;
    n = Jsi_ObjGetLength(interp, obj);

    if (start && Jsi_GetNumberFromValue(interp, start, &nstart) == JSI_OK) {
        istart = (int)nstart;
        if (istart > n)
            goto bail;
        if (istart < 0)
            istart = (n+istart);
        if (istart<0)
            goto bail;
    }
      
    if (n == 0) {
        goto bail;
    }
    iend = n-1;
    if (end && Jsi_GetNumberFromValue(interp,end, &nend) == JSI_OK) {
        iend = (int) nend;
        if (iend >= n)
            iend = n;
        if (iend < 0)
            iend = (n+iend);
        if (iend<0)
            goto bail;
    }
    nsiz = iend-istart+1;
    if (nsiz<=0)
        goto bail;

    int i;
    for (i = istart; i <= iend; i++)
    {
        if (obj->arr[i])
            Jsi_ValueCopy(interp, obj->arr[i], value);
        else
            obj->arr[i] = Jsi_ValueDup(interp, value);
    }
bail:
    if (_this != *ret) {
        Jsi_ValueMove(interp, *ret, _this);
        /*if (*ret)
            Jsi_DecrRefCount(interp, *ret);
        *ret = _this;
        Jsi_IncrRefCount(interp, *ret);*/
    }
    return rc;
}
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.