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function's local constants interdependence

Could someone please help me find a decent way to have local constants
defined using one another in order?
Simple "With[" doesn't work:

ff[x_,y_]:=With[{a=x, b=2*a},{a,b}]
> {x,2 a}

where I'd like it be >{x, 2 x}. I suspect it would work with "Module["
but I especially wanted them to be constants.

Do I have to nest With[ ? Or is there a prettier way?

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