No need to extract a limit for a boolean type

activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

@@ -668,7 +668,7 @@ def initialize_type_map(m) # :nodoc:
         register_integer_type m, %r(^smallint)i,  limit: 2
         register_integer_type m, %r(^tinyint)i,   limit: 1
 
-        m.alias_type %r(tinyint\(1\))i,  'boolean' if emulate_booleans
+        m.register_type %r(^tinyint\(1\))i, Type::Boolean.new if emulate_booleans
         m.alias_type %r(year)i,          'integer'
         m.alias_type %r(bit)i,           'binary'
 

activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb

@@ -38,10 +38,6 @@ def schema_type(column)
           end
         end
 
-        def schema_limit(column)
-          super unless column.type == :boolean
-        end
-
         def schema_precision(column)
           super unless /time/ === column.sql_type && column.precision == 0
         end