fn try_from_sexp_numeric_scalar<T>(sexp: SEXP) -> Result<T, SexpError>where i32: TryCoerce<T>, f64: TryCoerce<T>, u8: TryCoerce<T>, <i32 as TryCoerce<T>>::Error: Debug, <f64 as TryCoerce<T>>::Error: Debug, <u8 as TryCoerce<T>>::Error: Debug,