docs: def cbrt(x, context=None):
      """
      Return the cube root of x.
  
      For x negative, return a negative number.  The cube root of -0 is defined
      to be -0.
  
      """
      return _apply_function_in_current_context(
          BigFloat,
          mpfr.mpfr_cbrt,
          (BigFloat._implicit_convert(x),),
          context,
      )