value has the right type here

using `enum kind: [ :any, :income, :expense ]` syntax, value is already an
integer and using `enum kind: { any: 'any', income: 'income', expense:
'expense' }` syntax value is a string.

This allows us to define the mapping in the enum definition.

This reverts commit 933decceaf.

activerecord/lib/active_record/enum.rb

@@ -124,7 +124,7 @@ module ActiveRecord
 
       def deserialize(value)
         return if value.nil?
-        mapping.key(value.to_i)
+        mapping.key(value)
       end
 
       def serialize(value)