WalterDehnen

**Environment** version 4.3.2, C code, MacOS **Describe the bug** src/integrator_ias15.c line 591 reads timescale2 = (sqrt(y2*y4)+y3) / (sqrt(y3*y5)+y4); // A85 but correct is (equation 6 of Pham, Rein, Spiegel 2024),...

The current Range concept requires Range::Range(Range &range, split); Range::Range(Range &range, proportional_split); // optional This means that `Range` cannot be a POD type and that other constructors must be explicitly declared....