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On Wednesday 31 December 2003 03:51 pm, Richard Kelsey wrote: > Are there any implementations of Scheme in use where SCHEME_FALSE, > SCHEME_TRUE, SCHEME_NULL, or SCHEME_UNSPECIFIC should be freshly > allocated? Or where EQ? and == are not equivalent? (These are not > rhetorical questions; I really would like to know -- is this an > existing or only potential problem for portability?) This is not exhaustive, but a quick look at a few Schemes on my disk reveals that quite a few Schemes do use "constant objects": Kawa [boolean? is a test for instance of Boolean class] Stklos SXM TinyScheme Gauche Cheers, -KenD