Check subtype limit before using the default limit

activerecord/CHANGELOG.md

@@ -698,4 +698,10 @@
 
     *Yves Senn*
 
+*   Fixes #19420. When generating schema.rb using Postgres BigInt[] data type
+    the limit: 8 was not coming through. This caused it to become Int[] data type
+    after doing a rebuild off of schema.rb.
+
+    *Jake Waller*
+
 Please check [4-2-stable](https://github.com/rails/rails/blob/4-2-stable/activerecord/CHANGELOG.md) for previous changes.

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

@@ -18,7 +18,7 @@ class Array < Type::Value # :nodoc:
           end
 
           attr_reader :subtype, :delimiter
-          delegate :type, :user_input_in_time_zone, to: :subtype
+          delegate :type, :user_input_in_time_zone, :limit, to: :subtype
 
           def initialize(subtype, delimiter = ',')
             @subtype = subtype

activerecord/test/cases/schema_dumper_test.rb

@@ -248,6 +248,11 @@ def test_schema_dump_includes_bigint_default
       assert_match %r{t\.integer\s+"bigint_default",\s+limit: 8,\s+default: 0}, output
     end
 
+    def test_schema_dump_includes_limit_on_array_type
+      output = standard_dump
+      assert_match %r{t\.integer\s+"big_int_data_points\",\s+limit: 8,\s+array: true}, output
+    end
+
     if ActiveRecord::Base.connection.supports_extensions?
       def test_schema_dump_includes_extensions
         connection = ActiveRecord::Base.connection

activerecord/test/schema/postgresql_specific_schema.rb

@@ -93,4 +93,8 @@
     t.binary :binary, limit: 100_000
     t.text :text, limit: 100_000
   end
+
+  create_table :bigint_array, force: true do |t|
+    t.integer :big_int_data_points, limit: 8, array: true
+  end
 end