Possibly wrong TypeVar serialization with new typesystem

[amitmurthy]

julia> abstract AbsFoo

julia> type Foo <: AbsFoo
           x
       end

julia> type Bar{T<:AbsFoo}
           x::T
       end

julia> x = Bar[Bar(Foo(1)) for i in 1:2]
2-element Array{Bar,1}:
 Bar{Foo}(Foo(1))
 Bar{Foo}(Foo(1))

julia> io=IOBuffer();

julia> serialize(io, x);

julia> seekstart(io);

julia> deserialize(io)
ERROR: MethodError: Cannot `convert` an object of type Bar{Foo} to an object of type Bar{T<:AbsFoo} where T<:AbsFoo
This may have arisen from a call to the constructor Bar{T<:AbsFoo} where T<:AbsFoo(...),
since type constructors fall back to convert methods.
Stacktrace:
 [1] setindex!(::Array{Bar{T<:AbsFoo} where T<:AbsFoo,1}, ::Bar{Foo}, ::Int64) at ./array.jl:489
 [2] deserialize_array(::SerializationState{Base.AbstractIOBuffer{Array{UInt8,1}}}) at ./serialize.jl:727
 [3] handle_deserialize(::SerializationState{Base.AbstractIOBuffer{Array{UInt8,1}}}, ::Int32) at ./serialize.jl:578
 [4] deserialize(::SerializationState{Base.AbstractIOBuffer{Array{UInt8,1}}}) at ./serialize.jl:550
 [5] deserialize(::Base.AbstractIOBuffer{Array{UInt8,1}}) at ./serialize.jl:547