Remove to_liquid conversion from StandardFilters

test/integration/drop_test.rb

@@ -149,6 +149,8 @@ class DropsTest < Minitest::Test
     assert_equal(' carrot ', output)
   end
 
+  # This test succeed in the ruby implementation, but not in liquid-c
+  # See Context#contextualize
   def test_context_drop_array_with_map
     output = Liquid::Template.parse(' {{ contexts | map: "bar" }} ').render!('contexts' => [ContextDrop.new, ContextDrop.new], 'bar' => "carrot")
     assert_equal(' carrotcarrot ', output)

test/integration/standard_filter_test.rb

@@ -417,6 +417,8 @@ class StandardFiltersTest < Minitest::Test
     assert_template_result("", '{{ "foo" | map: "inspect" }}')
   end
 
+  # This test succeed in the ruby implementation, but not in liquid-c
+  # See Context#contextualize
   def test_map_calls_to_liquid
     t = TestThing.new
     assert_template_result("woot: 1", '{{ foo | map: "whatever" }}', "foo" => [t])
@@ -433,6 +435,8 @@ class StandardFiltersTest < Minitest::Test
     assert_template_result("42", template, "thing" => hash)
   end
 
+  # This test succeed in the ruby implementation, but not in liquid-c
+  # See Context#contextualize
   def test_sort_calls_to_liquid
     t = TestThing.new
     Liquid::Template.parse('{{ foo | sort: "whatever" }}').render("foo" => [t])