rk4_class%integrateModule: rklib_moduleI1a1aI1a1a: verifiedDerivatives / callbacks: right-hand side onlyClassical explicit fourth-order Runge-Kutta; not a claim about every integrator in the collection.Pinned source: src/rklib_fixed_steps.f90Author examples/tests: test/rk_decay.F90Load checked GAMS driver: gams-rklib-decay-oscillator