Trac 109: vm:double-float-bias is 1022
From Trac 109.
VM:DOUBLE-FLOAT-BIAS
is 1022, but the expected value is 1023.
There's probably some kind of historical reason CMUCL chose this value, but 1023 is the value used in all documents referring to IEEE754.
Same issue holds for VM:SINGLE-FLOAT-BIAS
.