diff --git a/Project.toml b/Project.toml
index a298945..14219bf 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "MetidaBase"
 uuid = "075456b7-4006-432f-9324-2f8453996c49"
 authors = ["PharmCat <v.s.arnautov@yandex.ru> and contributors"]
-version = "0.11.2"
+version = "0.11.3"
 
 [deps]
 CategoricalArrays = "324d7699-5711-5eae-9e2f-1d82baa6b597"
diff --git a/src/dataset.jl b/src/dataset.jl
index 00140fb..a7040c6 100644
--- a/src/dataset.jl
+++ b/src/dataset.jl
@@ -9,7 +9,7 @@ function getdata(d::DataSet)
     d.ds
 end
 
-@inline function getindormiss(d::Dict{K}, i::K) where K
+@inline function getindormiss(d::AbstractDict{K}, i::K) where K
     if haskey(d, i) return d[i]  end
     missing
 end
@@ -81,7 +81,7 @@ end
 ################################################################################
 # sort!
 ################################################################################
-function islessdict(a::Dict{A1,A2}, b::Dict{B1,B2}, k::Union{AbstractVector, Set}) where A1 where A2 where B1 where B2
+function islessdict(a::AbstractDict{A1,A2}, b::AbstractDict{B1,B2}, k::Union{AbstractVector, Set}) where A1 where A2 where B1 where B2
     l = length(k)
     av = Vector{Union{Missing, A2}}(undef, l)
     bv = Vector{Union{Missing, B2}}(undef, l)
@@ -91,7 +91,7 @@ function islessdict(a::Dict{A1,A2}, b::Dict{B1,B2}, k::Union{AbstractVector, Set
     end
     isless(av, bv)
 end
-function islessdict(a::Dict, b::Dict, k)
+function islessdict(a::AbstractDict, b::AbstractDict, k)
     isless(getindormiss(a, k), getindormiss(b, k))
 end
 function Base.sort!(d::DataSet{T}, k; alg::Base.Algorithm = QuickSort, lt=nothing, by=nothing, rev::Bool=false, order::Base.Ordering = Base.Forward) where T <: Union{AbstractIdData, AbstractIDResult}
diff --git a/test/runtests.jl b/test/runtests.jl
index 928aca4..51cab84 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -91,6 +91,9 @@ using Test, Tables, TypedTables, DataFrames, CSV
     end
     exidds = MetidaBase.DataSet(exiddsv)
     ############################################################################
+    @test Tables.istable(exidds) == false
+    @test Tables.rowaccess(exidds) == false
+    ############################################################################
     item = ExampleIDStruct(Dict(:c => 6, :j => 6))
     ds1 = deepcopy(exidds)
     ds2 = deepcopy(exidds)
@@ -123,6 +126,11 @@ using Test, Tables, TypedTables, DataFrames, CSV
     @test exrsds[1, :r1] == 3
 
     @test MetidaBase.getid(exidds[3], :a) == 2
+
+    dsr = exrsds[1:2]
+    @test length(dsr) == 2
+    @test exrsds[1] === dsr[1]
+    @test exrsds[2] === dsr[2]
     ######################################################################
     # SORT
     ######################################################################