Allen Wirfs-Brock wrote:
Isn't the anomaly (and the issue) that 2^53 (9,007,199,254,740,992) is both the
upper-end of the range of integers that can be exactly represented in IEEE
float64, it is is also the representation of the smallest positive integer
(2^53+1) that cannot be exactly represented.
In other words, if you see the IEEE float 64 encoding of 9,007,199,254,740,992
you don't know if it is an exact representation of 2^53 or an approximate
representation of 2^53+1.
2^53-1 is the max integer value whose encoding is not also an approximation of
some other integer value.
You're right, that's the reason. It helps make sense of some of the code
Jeff's mxr.mozilla.org link shows. We really do have a fencepost at
2^53, not a maximum precise integer value.
/be
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