message: fixed bug where MoreThuenteLinesearch ended up in an infinite loop
diff: @@ -226,7 +226,7 @@ where
  width1: std::f64::NAN,
  xtol: 1e-10,
  alpha: 1.0,
  - stpmin: 1e-15,
  + stpmin: std::f64::EPSILON.sqrt(),
  stpmax: std::f64::INFINITY,
  stp: Step::default(),
  stx: Step::default(),
  