[issue1910] Document that with is slower than try/finally

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

In ceval.c, the "case WITH_CLEANUP" contains the following lines:
  /* XXX Not the fastest way to call it... */
  x = PyObject_CallFunctionObjArgs(x, u, v, w, NULL);

Maybe this is something not too difficult to improve?

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<http://bugs.python.org/issue1910>
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