v6.86.0

OrdinaryDiffEq v6.86.0

Diff since v6.85.0

Merged pull requests:

• added method ROK4a (#2260) (@cwittens)
• Added SSPRK methods (#2264) (@ParamThakkar123)
• Added Feagin Package (#2267) (@ParamThakkar123)
• Added OrdinaryDiffEqSymplecticRK (#2268) (@ParamThakkar123)
• Don't use prev_theta for non-adaptive solves (#2269) (@oscardssmith)
• don't define trivial_limiter! in sub-packages (#2270) (@oscardssmith)
• remove array specialization (#2271) (@oscardssmith)
• Added RKN methods (#2272) (@ParamThakkar123)
• Added Verner Methods (#2274) (@ParamThakkar123)
• fix default algorithm interpolation (#2275) (@oscardssmith)
• Allow any chunksize for CompiledFloats (#2276) (@ChrisRackauckas)
• typo fix (#2280) (@oscardssmith)
• add PositiveIntegrators.jl to downstream tests (#2281) (@ranocha)

Closed issues:

• Memory leak in solving ODE many times (#1946)
• UndefRefError: cache.cache5 doesn't exist? (#2279)