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A general description is here.
‘stl()’ now checks its 3 x 3 tuning parameters on the R level; ‘stl(*, s.window = 0)’ now “works” instead dumping core, ‘stl(*, s.window = 1)’ “works” correctly, too. Also, the ‘summary()’ method mentions the robustness ‘weights’ only if any robustness iterations happened.
Further, ‘stl()’ is now based on C code, translated from previous Fortran, triggered by a flang 22 compiler optimization bug (‘-O2’).