Reading structs from binary stream

General Usage
1

What is the up-to-date, idiomatic method of deserializing a stream of un-padded binary values from an external source into Julia struct?

StrPack.jl carries a big warning that it is not actively maintained.

2

So far the best solution that I found looks like this:

function Base.read(io::IO, strc_t::Union{Type{S1},
                                        Type{S2},
                                        Type{S3}})
    fn = fieldnames(strc_t)
    vals = Vector{Any}(undef, length(fn))
    for (n, f) in enumerate(fn)
        vals[n] = read(io, fieldtype(strc_t, f))
    end
    return strc_t(vals...)
end

function Base.write(io::IO, strc::Union{S1, S2, S3})
    sum([write(io, getfield(strc, f)) 
        for f in fieldnames(typeof(strc))])
end

That should work for scenario where types are like this

struct S1
  a::Int8
  b::UInt16
...
end

struct S2
  c::Float64
  d::Int
...
end

struct S3
   x::S1
   y::S2
end

Criticisms are welcome.

(By the way, I was surprised that there is no default write method for tuples, why is that?)