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Addressed SF bug 421973 (finally). Rewrote the subsection on coercion rules (and made it a proper subsection, with a label). The new section is much less precise, because precise rules would be too hard to give (== I don't know what they are any more :-). OTOH, the new section gives much more up-to-date information. Also noted that __coerce__ may return NotImplemented, with the same meaning as None. FLD: My modifications to Guido's markup are included from revision 1.90.