code: def pos(x, context=None):
      
      return _apply_function_in_current_context(
          BigFloat,
          mpfr.mpfr_set,
          (BigFloat._implicit_convert(x),),
          context,
      )
docs: Return ``x``.
  
      As usual, the result is rounded to the current context.  The ``pos``
      function can be useful for rounding an intermediate result, computed with a
      temporary increase in precision, back to the current context.  For
      example::
  
          >>> from bigfloat import precision
          >>> pow(3, 20) + 1.234 - pow(3, 20)  # inaccurate due to precision loss
          BigFloat.exact('1.2340002059936523', precision=53)
          >>> with precision(100):  # compute result with extra precision
          ...     x = pow(3, 20) + 1.234 - pow(3, 20)
          ...
          >>> x
          BigFloat.exact('1.2339999999999999857891452847980', precision=100)
          >>> pos(x)  # round back to original precision
          BigFloat.exact('1.2340000000000000', precision=53)