MATLAB: How does matlab compute hypergeom

Question

I want to know what method Matlab uses to compute hypergeom (generalised hypergeometric function) if I input say floats rather than symbolic variables. For instance does it simply use the power series or is there some sort of continued fraction approximation?

Answer 1

Historical method: https://www.mathworks.com/matlabcentral/answers/350039-is-there-any-way-to-speed-up-the-calculation-of-the-confluent-hypergeometric-function

You can read the current method:

strjoin(regexp(char(evalin(symengine,'expose(hypergeom)')), '\\n', 'split'), '\n')