Removed some rails version variables that are no longer needed

Author: Rob Widmer

lib/arjdbc/jdbc.rb

@@ -2,12 +2,8 @@
 
 module ArJdbc
 
-  # @private
-  AR40 = ::ActiveRecord::VERSION::MAJOR > 3
   # @private
   AR42 = ::ActiveRecord::VERSION::STRING >= '4.2'
-  # @private
-  AR50 = ::ActiveRecord::VERSION::MAJOR > 4
 
   class << self
 

lib/arjdbc/jdbc/column.rb

@@ -26,23 +26,17 @@ def initialize(config, name, *args)
           end
         end
 
-        if ArJdbc::AR50
-          default = args[0].cast(default)
+        default = args[0].cast(default)
 
-          sql_type = args.delete_at(1)
-          type = args.delete_at(0)
+        sql_type = args.delete_at(1)
+        type = args.delete_at(0)
 
-          args.unshift(SqlTypeMetadata.new(:sql_type => sql_type, :type => type))
-        elsif ArJdbc::AR42
-          default = args[0].type_cast_from_database(default)
-        else
-          default = default_value(default)
-        end
+        args.unshift(SqlTypeMetadata.new(:sql_type => sql_type, :type => type))
 
         # super <= 4.1: (name, default, sql_type = nil, null = true)
         # super >= 4.2: (name, default, cast_type, sql_type = nil, null = true)
         # super >= 5.0: (name, default, sql_type_metadata = nil, null = true)
-        
+
         super(name, default, *args)
         init_column(name, default, *args)
       end