correct canbeuninitialized (#517)

* correct canbeuninitialized

* add test

* non-transitive custom serialization

---------

Co-authored-by: Jonas Isensee <jonas.isensee@ds.mpg.de>

src/data/custom_serialization.jl

@@ -38,7 +38,7 @@ h5convert_uninitialized!(out::Pointers, odr::Type{CustomSerialization{T,ODR}}) w
  h5convert_uninitialized!(out, ODR)
 
 jlconvert_canbeuninitialized(::ReadRepresentation{T,CustomSerialization{S,ODR}}) where {T,S,ODR} =
- jlconvert_canbeuninitialized(ODR)
+ jlconvert_canbeuninitialized(ReadRepresentation{S,ODR}())
 jlconvert_isinitialized(::ReadRepresentation{T,CustomSerialization{S,ODR}}, ptr::Ptr) where {T,S,ODR} =
  jlconvert_isinitialized(ReadRepresentation{S,ODR}(), ptr)
 

test/loadsave.jl

@@ -556,10 +556,16 @@ Base.@kwdef mutable struct T3 <: AT
  t2::T2
 end
 
-DSA=Dict{Symbol, Any}
+# Custom Serialization is not transitive, so using a custom serialization via a type
+# that is custom serialized itself will not work
+mutable struct PseudoDict{K,V}
+ kv::Vector{Pair{K,V}}
+end
+
+DSA=PseudoDict{Symbol, Any}
 JLD2.writeas(::Type{T}) where {T <: AT} = DSA
-JLD2.wconvert(::Type{DSA}, t::AT) = DSA(f => getproperty(t, f) for f in fieldnames(typeof(t)))
-JLD2.rconvert(::Type{T}, dsa::DSA) where {T <: AT} = T(; dsa...)
+JLD2.wconvert(::Type{DSA}, t::AT) = DSA([f => getproperty(t, f) for f in fieldnames(typeof(t))])
+JLD2.rconvert(::Type{T}, dsa::DSA) where {T <: AT} = T(; dsa.kv...)
 
 @testset "Issue #431 Identity-Preservation" begin
  cd(mktempdir()) do
@@ -687,3 +693,13 @@ end
  @test T == load("test.jld2", "T")
  end
 end
+
+
+@testset "Issue #510 uninitialized Dicts" begin
+ cd(mktempdir()) do
+ save_object("test.jld2", Vector{Dict{String,Float64}}(undef, 10))
+ o = load_object("test.jld2")
+ @test !any(isassigned.(Ref(o), eachindex(o)))
+ end
+
+end