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Paul Eggert authored
Change logb to return -infinity, +infinity, and NaN respectively. Formerly logb returned an extreme fixnum to represent infinity, but this is no longer the right thing to do now that we have bignums and there is no extreme integer. * doc/lispref/numbers.texi (Float Basics), etc/NEWS: Document. * src/floatfns.c (Flogb): Implement this.
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