Preserve order of struct fields?

[Marlin-Na]

Hi, would you consider using OrderedDict instead of Dict when reading struct, so that the order of struct fields can be preserved? The following patch has worked for my particular application. (Though I have been wishing Julia's default Dict implementation can preserve order)

diff --git a/src/MAT_HDF5.jl b/src/MAT_HDF5.jl
index cfacf3e..f0c8d90 100644
--- a/src/MAT_HDF5.jl
+++ b/src/MAT_HDF5.jl
@@ -32,6 +32,7 @@ using HDF5, SparseArrays
 
 import Base: names, read, write, close
 import HDF5: Reference
+import OrderedCollections: OrderedDict
 
 const HDF5Parent = Union{HDF5.File, HDF5.Group}
 const HDF5BitsOrBool = Union{HDF5.BitsType,Bool}
@@ -230,12 +231,8 @@ function m_read(g::HDF5.Group)
             error("Cannot read from a non-struct group, type was $mattype")
         end
     end
-    if haskey(g, "MATLAB_fields")
-        fn = [join(f) for f in read_attribute(g, "MATLAB_fields")]
-    else
-        fn = keys(g)
-    end
-    s = Dict{String, Any}()
+    fn = [join(f) for f in read_attribute(g, "MATLAB_fields")]
+    s = OrderedDict{String, Any}()
     for i = 1:length(fn)
         dset = g[fn[i]]
         try