FWIW, units on macOS (not GNU) handles conversion of `10 degC` to `degF` correctly, although it dates back to 1993. It seems that GNU units at some point added

FWIW, units on macOS (not GNU) handles conversion of `10 degC` to `degF` correctly, although it dates back to 1993. It seems that GNU units at some point added support for several non-linear units, which may have prompted them to rethink their syntax.