Serialization doesn't work with IOStream

[omus]

julia> using BitIntegers, Serialization

julia> file = tempname()
"/var/folders/m2/jn0j4mc13p56hxw8c9tjtqsc0000gn/T/jl_8QgWFG"

julia> open(file, "w") do io
           serialize(Serializer(io), UInt512(1))
       end

julia> open(file, "r") do io
           deserialize(Serializer(io))
       end
ERROR: The IO stream does not support reading objects of type UInt512.
Stacktrace:
 [1] error(::String) at ./error.jl:33
 [2] read(::IOStream, ::Type{T} where T) at ./io.jl:946
 [3] deserialize(::Serializer{IOStream}, ::DataType) at /Users/omus/Development/Julia/1.5/usr/share/julia/stdlib/v1.5/Serialization/src/Serialization.jl:1331
 [4] handle_deserialize(::Serializer{IOStream}, ::Int32) at /Users/omus/Development/Julia/1.5/usr/share/julia/stdlib/v1.5/Serialization/src/Serialization.jl:837
 [5] deserialize(::Serializer{IOStream}) at /Users/omus/Development/Julia/1.5/usr/share/julia/stdlib/v1.5/Serialization/src/Serialization.jl:773
 [6] #3 at ./REPL[4]:2 [inlined]
 [7] open(::var"#3#4", ::String, ::Vararg{String,N} where N; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at ./io.jl:325
 [8] open(::Function, ::String, ::String) at ./io.jl:323
 [9] top-level scope at REPL[4]:1