Refactor the type casting of booleans in MySQL

activerecord/lib/active_record/connection_adapters/abstract/quoting.rb

@@ -55,8 +55,8 @@ def type_cast(value, column)
         case value
         when String, ActiveSupport::Multibyte::Chars
           value.to_s
-        when true       then 't'
+        when true       then unquoted_true
-        when false      then 'f'
+        when false      then unquoted_false
         when nil        then nil
         # BigDecimals need to be put in a non-normalized form and quoted.
         when BigDecimal then value.to_s('F')
@@ -101,10 +101,18 @@ def quoted_true
         "'t'"
       end
 
+      def unquoted_true
+        't'
+      end
+
       def quoted_false
         "'f'"
       end
 
+      def unquoted_false
+        'f'
+      end
+
       def quoted_date(value)
         if value.acts_like?(:time)
           zone_conversion_method = ActiveRecord::Base.default_timezone == :utc ? :getutc : :getlocal

activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

@@ -178,17 +178,6 @@ def supports_index_sort_order?
         true
       end
 
-      def type_cast(value, column)
-        case value
-        when TrueClass
-          1
-        when FalseClass
-          0
-        else
-          super
-        end
-      end
-
       # MySQL 4 technically support transaction isolation, but it is affected by a bug
       # where the transaction level gets persisted for the whole session:
       #
@@ -253,10 +242,18 @@ def quoted_true
         QUOTED_TRUE
       end
 
+      def unquoted_true
+        1
+      end
+
       def quoted_false
         QUOTED_FALSE
       end
 
+      def unquoted_false
+        0
+      end
+
       # REFERENTIAL INTEGRITY ====================================
 
       def disable_referential_integrity #:nodoc: