var_range changes behaviour if eplex loaded

Hi,

You may well know already, but var_range reports zero differently according to whether eplex is loaded.

E.g. 1       lib(range).
2       lib(ria).
3       ria : (X :: 0 .. 10), var_range(X, L, H).
4       lib(eplex).
5       ria : (X :: 0 .. 10), var_range(X, L, H).

3 gives L = 0.0 whereas 5 gives L = -0.0

Doing something like ria:(L >= 0) is a workaround.

Ran into this this week, as a test VarMin == 0.0 started failing.
Think it's the same in 5.4, 5.5 and prerelease.

Cheers,

Jonathan