Dump array subtype options correctly

Currently schema dumper does not dump array subtype `precision` and
`scale` options. This commit fixes the issue.

activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb

@@ -6,7 +6,7 @@ class Array < Type::Value # :nodoc:
           include Type::Helpers::Mutable
 
           attr_reader :subtype, :delimiter
-          delegate :type, :user_input_in_time_zone, :limit, to: :subtype
+          delegate :type, :user_input_in_time_zone, :limit, :precision, :scale, to: :subtype
 
           def initialize(subtype, delimiter = ",")
             @subtype = subtype

activerecord/test/cases/adapters/postgresql/array_test.rb

@@ -16,10 +16,11 @@ def setup
 
     @connection.transaction do
       @connection.create_table("pg_arrays") do |t|
-        t.string "tags", array: true
+        t.string "tags", array: true, limit: 255
         t.integer "ratings", array: true
         t.datetime :datetimes, array: true
         t.hstore :hstores, array: true
+        t.decimal :decimals, array: true, default: [], precision: 10, scale: 2
       end
     end
     PgArray.reset_column_information
@@ -34,7 +35,7 @@ def setup
 
   def test_column
     assert_equal :string, @column.type
-    assert_equal "character varying", @column.sql_type
+    assert_equal "character varying(255)", @column.sql_type
     assert @column.array?
     assert_not @type.binary?
 
@@ -110,8 +111,9 @@ def test_type_cast_integers
 
   def test_schema_dump_with_shorthand
     output = dump_table_schema "pg_arrays"
-    assert_match %r[t\.string\s+"tags",\s+array: true], output
+    assert_match %r[t\.string\s+"tags",\s+limit: 255,\s+array: true], output
     assert_match %r[t\.integer\s+"ratings",\s+array: true], output
+    assert_match %r[t\.decimal\s+"decimals",\s+precision: 10,\s+scale: 2,\s+default: \[\],\s+array: true], output
   end
 
   def test_select_with_strings