Remove old AR versioning checks

Author: enebo

lib/arel/visitors/compat.rb

@@ -4,44 +4,16 @@ module ArJdbcCompat
 
       protected
 
-      if ToSql.instance_method('visit').arity == 1
-        def do_visit(x, a); visit(x); end # a = nil
-      else # > AREL 4.0
-        def do_visit(x, a); visit(x, a); end
-      end
+      def do_visit(x, a); visit(x, a); end
 
-      if ToSql.instance_method('visit_Arel_Nodes_SelectCore').arity == 1
-        def do_visit_select_core(x, a) # a = nil
-          visit_Arel_Nodes_SelectCore(x)
-        end
-      else # > AREL 4.0
-        def do_visit_select_core(x, a)
-          visit_Arel_Nodes_SelectCore(x, a)
-        end
+      def do_visit_select_core(x, a)
+        visit_Arel_Nodes_SelectCore(x, a)
       end
 
       private
 
-      if ArJdbc::AR42
-        if Arel::VERSION < '6.0.2'
-          def limit_for(limit_or_node)
-            if limit_or_node.respond_to?(:expr)
-              expr = limit_or_node.expr
-              # NOTE(uwe): Different behavior for Arel 6.0.0 and 6.0.2
-              expr.respond_to?(:value) ? expr.value.to_i : expr.to_i
-            else
-              limit_or_node
-            end
-          end
-        else
-          def limit_for(limit_or_node)
-            limit_or_node.respond_to?(:expr) ? limit_or_node.expr.to_i : limit_or_node
-          end
-        end
-      else
-        def limit_for(limit_or_node)
-          limit_or_node.respond_to?(:expr) ? limit_or_node.expr.to_i : limit_or_node
-        end
+      def limit_for(limit_or_node)
+        limit_or_node.respond_to?(:expr) ? limit_or_node.expr.to_i : limit_or_node
       end
       module_function :limit_for