[julia-users] hashing floating point zeroes

[Davide Lasagna]

Hi, 

I have just been bitten by a function hashing a custom type containing a 
vector of floats. It turns out that hashing positive and negative floating 
point zeros returns different hashes. 

Demo:
julia> hash(-0.0)
0x3be7d0f7780de548

julia> hash(0.0)
0x77cfa1eef01bca90

julia> hash(0)
0x77cfa1eef01bca90

Is this expected behaviour?