In integrals variable integration limits work fine with sage.
Now I would like to plot the variable integration range with plot3d or
parametric_plot3d using variable plot range limits:

u,v = var('u v')
parametric_plot3d([u, v, u*0.1], (u, 0, 6), (v, 0, u))

But I get the following errors message:

Traceback (click to the left for traceback)
...
TypeError: float() argument must be a string or a number

If I replace the last variable u with a constant value like 6 then the
plot works but that is not what I want.
Is there a way to plot with variable plot limits?
Thanks.
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