bug: weird issues with big MultiFloats

[nsajko]

julia> using MultiFloats

julia> MultiFloats.use_standard_multifloat_arithmetic(20)

julia> g(n::Integer) = rand(MultiFloat{Float64, n})
g (generic function with 1 method)

julia> x = g(20)
-2.2914735159347884e+302

julia> 1 < x
false

julia> x < -1
true

julia> Float64(x)
0.6714350546186427

So it seems there are multiple issues here:

1. rand produces a number of huge magnitude
2. rand produces negative number
3. the conversion to Float64 (producing a positive number) is not consistent with the < operator