Merge branch 'master' into constructors

src/ordered_dict.jl

@@ -98,6 +98,7 @@ isordered(::Type{T}) where {T<:OrderedDict} = true
 
 # conversion between OrderedDict types
 function convert(::Type{OrderedDict{K,V}}, d::AbstractDict) where {K,V}
+ d isa OrderedDict{K, V} && return d
  if !isordered(typeof(d))
  Base.depwarn("Conversion to OrderedDict is deprecated for unordered associative containers (in this case, $(typeof(d))). Use an ordered or sorted associative type, such as SortedDict and OrderedDict.", :convert)
  end
@@ -112,7 +113,6 @@ function convert(::Type{OrderedDict{K,V}}, d::AbstractDict) where {K,V}
  end
  return h
 end
-convert(::Type{OrderedDict{K,V}},d::OrderedDict{K,V}) where {K,V} = d
 
 isslotempty(slot_value::Integer) = slot_value == 0
 isslotfilled(slot_value::Integer) = slot_value > 0
@@ -493,4 +493,4 @@ function Base.map!(f, iter::Base.ValueIterator{<:OrderedDict})
  return iter
 end
 
-last(h::OrderedDict) = h.keys[end] => h.vals[end]
+last(h::OrderedDict) = h.keys[end] => h.vals[end]