Fixed Array test

lib/polars/data_types.rb

@@ -227,9 +227,9 @@ def to_s
   class Array < NestedType
     attr_reader :width, :inner
 
-    def initialize(width, inner)
+    def initialize(width, inner = nil)
       @width = width
-      @inner = Utils.rb_type_to_dtype(inner)
+      @inner = Utils.rb_type_to_dtype(inner) if inner
     end
 
     # TODO check width?

lib/polars/series.rb

@@ -3846,6 +3846,10 @@ def sequence_to_rbseries(name, values, dtype: nil, strict: true, dtype_if_empty:
       end
 
       if !dtype.nil? && ![List, Unknown].include?(dtype) && Utils.is_polars_dtype(dtype) && ruby_dtype.nil?
+        if dtype == Array && !dtype.is_a?(Array) && value.is_a?(::Array)
+          dtype = Array.new(value.size)
+        end
+
         constructor = polars_type_to_constructor(dtype)
         rbseries = constructor.call(name, values, strict)
 
@@ -3966,7 +3970,7 @@ def sequence_from_anyvalue_or_object(name, values)
     }
 
     def polars_type_to_constructor(dtype)
-      if dtype == Array || dtype.is_a?(Array)
+      if dtype.is_a?(Array)
         lambda do |name, values, strict|
           RbSeries.new_array(dtype.width, dtype.inner, name, values, strict)
         end

test/types_test.rb

@@ -129,8 +129,6 @@ def test_series_dtype_list_dtype
   end
 
   def test_series_dtype_array
-    skip # TODO fix
-
     s = Polars::Series.new([[1, 2], [3, 4]], dtype: Polars::Array)
     assert_series [[1, 2], [3, 4]], s, dtype: Polars::Array.new(2, Polars::Int64)
   end