diffrax
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Implement the IAS15 solver
https://ui.adsabs.harvard.edu/abs/2015MNRAS.446.1424R/abstract It's an adaptive symplectic integrator with superior speed and performance. Currently the symplectic solver in diffrax is not adaptive. Implementing this solver would offer an improved symplectic option.
Sounds good! I'd be happy to consider a PR on this.