Appel F1 implementation in Julia?

Hi, do you guys know if there is any impelemntation of the Appel hypergeometric function in Julia?

AppellF1[a, b1, b2, c, x, y]

I had a look into HypergeometricFunctions.jl, but only found the implementation of Gauss’s hypergeometric series.

This has an open issue with some nice advice from @TSGut here