Error with `antijoin` when encountering `-0.0` value?

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3

The reason is that == is not a test of equality used in joins.
The test of equality is isequal:

julia> isequal(0.0, -0.0)
false

This difference is exactly the reason why joining on -0.0 is by default disallowed as the result could confuse the user.

Note that the same is for e.g. Set or Dict:

julia> Set([0.0, -0.0])
Set{Float64} with 2 elements:
  0.0
  -0.0

julia> Dict(0.0=>1, -0.0=>2)
Dict{Float64, Int64} with 2 entries:
  0.0  => 1
  -0.0 => 2
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