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Wikibook for Common Lisp says that fixnums are guaranteed to be able to hold integer values in [-215; 215-1] range and that it is implementation dependent. *features* can tell me if the host is 32 or 64-bit but a fixnum in Lisp does not cover the whole 32/64 bits. Is there a way to programmatically check what is the size of a fixnum in a CL implementation?
(integer-length most-negative-fixnum)will tell you.