docs: def sqrt(x, context=None):
      """
      Return the square root of ``x``.
  
      Return -0 if x is -0, to be consistent with the IEEE 754 standard.  Return
      NaN if x is negative.
  
      """
      return _apply_function_in_current_context(
          BigFloat,
          mpfr.mpfr_sqrt,
          (BigFloat._implicit_convert(x),),
          context,
      )