When getting rough with floating-point numbers, several constants come in
handy, especially the "machine epsilon". (Note there is some confusion in
definition of "machine epsilon" and "unit roundoff" - the definition below
is the one we want and the one used in the C library.)
Proposals:
Number.EPSILON == 2^-52
The difference between 1 and the smallest value >1 that is representable as
a floating-point number.
Number.MIN_NORMAL == 2^-1022
The minimum positive value that can be stored as an IEEE normal number.
Number.MAX_INTEGER == 2^53 - 1
The maximum integer value that can be stored in a number without losing
precision.
(OK, so technically 2^53 can be stored, but that's an anomaly.)
Number.MAX_POWTWO == 2^1023
The maximum power-of-two that can be stored in a number.
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