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Aubrey Jaffer <agj@xxxxxxxxxxxx> writes: > So I would prefer the (/ 0. 0.) option because I think it will arise > rarely, if ever. The tradition of Lisp and Scheme is to use the same notation for constants in the program source and for the textual representation produced by the printer, as much as it's practical (i.e. excluding objects which are "active" rather than being pure values). Therefore I see no reason to reject as a NaN literal the same textual form which is used when it's printed. -- __("< Marcin Kowalczyk \__/ qrczak@xxxxxxxxxx ^^ http://qrnik.knm.org.pl/~qrczak/