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Here's a workaround: assign the positions of the parameters to
variables.

Example (compute s(a,t)=1/2 a * t^2 ):

a=1
t=2
s()="1/2 * x(a) * x(t)^2"

s(9.8:1)
-> 4.9

While this is not the pinnacle of readability, it is an
improvement.

-mendel