Question: looking for 2F1 numerics / exceptional parameter case

May be a bit off that forum, but may be somebody has an answer or some reference: for the linear transforms w = 1 - z and w = 1/z there are exceptional cases given the formulae in Abramowitz & et al do involve infinite series in Psi (A&S 15.3.11 ff). A direct coding becomes slow and it is awesome to dig through Maple's code for that. Does there exist s.th. worth to look into it (please no pure source code like Macsyma or so ...) ?
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