RK45 tableau, dense-output coefficients and step-control logic are adapted
from the locally installed SciPy integrate/_ivp/rk.py and common.py.
The implementation is rewritten in C; SciPy is not linked or required.

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Ryu binary64 shortest conversion
Copyright 2018 Ulf Adams
Upstream: https://github.com/ulfjack/ryu
Commit: 4c0618b0e44f7ef027ebae05d2cc7812048f7c8f
The vendored ryu files are used under the following license option:

Boost Software License - Version 1.0 - August 17th, 2003

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