revert

Author: NoureldinYosri

tunits/core/cython/with_unit.pyx

@@ -669,11 +669,6 @@ cdef class WithUnit:
     def sign(self) -> int | np.ndarray:
         return np.sign(self.value_in_base_units())
 
-    def dimensionless(self) -> float | np.ndarray:
-        if not self._is_dimensionless():
-            raise ValueError(f'{self} is not dimensionless')
-        return self.value_in_base_units()
-
 _try_interpret_as_with_unit = None
 _is_value_consistent_with_default_unit_database = None
 def init_base_unit_functions(