Delegate serializable? to subtype on Enum

Since #41516, values on Enum are not always serializable.

activerecord/lib/active_record/enum.rb

@@ -115,7 +115,7 @@ def inherited(base) # :nodoc:
     end
 
     class EnumType < Type::Value # :nodoc:
-      delegate :type, to: :subtype
+      delegate :type, :serializable?, to: :subtype
 
       def initialize(name, mapping, subtype)
         @name = name
@@ -128,10 +128,8 @@ def cast(value)
           value.to_s
         elsif mapping.has_value?(value)
           mapping.key(value)
-        elsif value.blank?
-          nil
         else
-          assert_valid_value(value)
+          value.presence
         end
       end
 

activerecord/test/cases/enum_test.rb

@@ -94,6 +94,10 @@ class EnumTest < ActiveRecord::TestCase
     assert_nil Book.where(status: "prohibited").first
   end
 
+  test "find via where with large number" do
+    assert_equal @book, Book.where(status: [2, 9223372036854775808]).first
+  end
+
   test "find via where should be type casted" do
     book = Book.enabled.create!
     assert_predicate book, :enabled?