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    • mevenson@1c010e3e-69d0-11dd-93a8-456734b0d56f's avatar
      Numeric tower repairs on promoting floats across representation boundaries. · 56638363
      Thanks to Massimiliano Ghilardi.
      
      If a bignum exceeds the largest representable single-float,
      EQUALP will raise a type-error when comparing it to a single-float.
      The same problem happens with double-floats.
      
      I am reporting this because my understanding of CLHS
      http://www.lispworks.com/documentation/lw51/CLHS/Body/f_equalp.htm#equalp
      tells that EQUALP is not supposed to raise errors at all:
      "Exceptional Situations: None."
      
      How to reproduce:
      
      ;; =========== double-floats ===========
      (= (ash 1 1024) most-positive-double-float)
      NIL
      
      (equalp (ash 1 1024) most-positive-double-float)
      ; Evaluation aborted on #<TYPE-ERROR {215F90FE}>.
      
      
      ;; =========== single-floats ===========
      (= 340282360000000000000000000000000000000 0.0f0)
      NIL
      
      (equalp 340282360000000000000000000000000000000 0.0f0)
      ; Evaluation aborted on #<TYPE-ERROR {1CFFC364}>.
      56638363
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