-0.0, storing zeros other than zero(eltype(v))

[LilithHafner]

For almost any value and assignable expression in Julia, this holds:

expr = value
@assert expr === value

I wish this held, too:

v = spzeros(1)
value = -0.0
v[1] = value
@assert v[1] === value

[chriselrod]

No.

julia> v = zeros(1); # Vector{Float64}

julia> value = 0;

julia> v[1] = value;

julia> @assert v[1] === value
ERROR: AssertionError: v[1] === value
Stacktrace:
 [1] top-level scope
   @ REPL[18]:1

Also, it is not hard to get -0.0 accidentally

julia> -3.4 * 0.0
-0.0

why should we have to filter these manually?

[SobhanMP]

1: you're forcing the type here tho, that's not part of @LilithHafner's point
2: not all zeros are equal, i personally learned it the hard way JuliaDiff/ForwardDiff.jl#542 this way we only remove zeros we are sure we can restore.