delete! works lazily?

[Indigo2233]

I would like to implement LRUCache by OrderedDict. However, it showed me

julia> a = OrderedDict{Int, Int}(1 => 1, 2=>2)
OrderedDict{Int64, Int64} with 2 entries:
  1 => 1
  2 => 2

julia> delete!(a, 2);

julia> a.keys
2-element Vector{Int64}:
 1
 2

julia> a
OrderedDict{Int64, Int64} with 1 entry:
  1 => 1

julia> a.keys
1-element Vector{Int64}:
 1

[oxinabox]

Field's of a struct are private unless documented otherwise.
If you want to know the keys use keys(a).

I suspect we are indeed lazy. and they stay around while a.dirty==true, which IIRC stays around til rehash! gets called.
Which will happen automatically at "appropriate" times