diff --git a/jedi/evaluate/base_context.py b/jedi/evaluate/base_context.py
index b1fdb9ac..318a5359 100644
--- a/jedi/evaluate/base_context.py
+++ b/jedi/evaluate/base_context.py
@@ -62,6 +62,9 @@ class HelperContextMixin:
         return False
 
     def is_same_class(self, class2):
+        # Class matching should prefer comparisons that are not this function.
+        if type(class2).is_same_class != HelperContextMixin.is_same_class:
+            return class2.is_same_class(self)
         return self == class2
 
 
diff --git a/jedi/evaluate/context/function.py b/jedi/evaluate/context/function.py
index c5afc758..c9722eed 100644
--- a/jedi/evaluate/context/function.py
+++ b/jedi/evaluate/context/function.py
@@ -292,8 +292,8 @@ class FunctionExecutionContext(TreeContext):
         if debug.enable_notice:
             signature = parser_utils.get_call_signature(self.tree_node)
             if matches:
-                debug.dbg("Overloading match: %s@%s",
-                          signature, self.tree_node.start_pos[0], color='BLUE')
+                debug.dbg("Overloading match: %s@%s (%s)",
+                          signature, self.tree_node.start_pos[0], self.var_args, color='BLUE')
             else:
                 debug.dbg("Overloading no match: %s@%s (%s)",
                           signature, self.tree_node.start_pos[0], self.var_args, color='BLUE')
diff --git a/jedi/evaluate/context/iterable.py b/jedi/evaluate/context/iterable.py
index 0c4b0137..04dccf87 100644
--- a/jedi/evaluate/context/iterable.py
+++ b/jedi/evaluate/context/iterable.py
@@ -191,6 +191,11 @@ class ComprehensionMixin(object):
         return "<%s of %s>" % (type(self).__name__, self._atom)
 
 
+class _DictMixin(object):
+    def _get_generics(self):
+        return tuple(c_set.py__class__() for c_set in self.get_mapping_item_contexts())
+
+
 class Sequence(BuiltinOverwrite, IterableMixin):
     api_type = u'instance'
 
@@ -198,11 +203,17 @@ class Sequence(BuiltinOverwrite, IterableMixin):
     def name(self):
         return compiled.CompiledContextName(self, self.array_type)
 
+    def _get_generics(self):
+        return (self.merge_types_of_iterate().py__class__(),)
+
     @memoize_method
     def get_object(self):
+        from jedi.evaluate.context.typing import AnnotatedSubClass
         klass = compiled.builtin_from_name(self.evaluator, self.array_type)
-        instance, = klass.execute_evaluated(self)
-        return instance
+        return AnnotatedSubClass(
+            self.evaluator, klass.parent_context, klass.tree_node,
+            self._get_generics()
+        ).execute_annotation()
 
     def py__bool__(self):
         return None  # We don't know the length, because of appends.
@@ -237,7 +248,7 @@ class SetComprehension(ComprehensionMixin, Sequence):
     array_type = u'set'
 
 
-class DictComprehension(ComprehensionMixin, Sequence):
+class DictComprehension(_DictMixin, ComprehensionMixin, Sequence):
     array_type = u'dict'
 
     def _get_comp_for(self):
@@ -413,7 +424,7 @@ class SequenceLiteralContext(Sequence):
         return "<%s of %s>" % (self.__class__.__name__, self.atom)
 
 
-class DictLiteralContext(SequenceLiteralContext):
+class DictLiteralContext(_DictMixin, SequenceLiteralContext):
     array_type = u'dict'
 
     def __init__(self, evaluator, defining_context, atom):
@@ -479,7 +490,7 @@ class FakeSequence(_FakeArray):
         return "<%s of %s>" % (type(self).__name__, self._lazy_context_list)
 
 
-class FakeDict(_FakeArray):
+class FakeDict(_DictMixin, _FakeArray):
     def __init__(self, evaluator, dct):
         super(FakeDict, self).__init__(evaluator, dct, u'dict')
         self._dct = dct
diff --git a/jedi/evaluate/param.py b/jedi/evaluate/param.py
index d00e8116..cadfedb7 100644
--- a/jedi/evaluate/param.py
+++ b/jedi/evaluate/param.py
@@ -1,5 +1,6 @@
 from collections import defaultdict
 
+from jedi import debug
 from jedi.evaluate.utils import PushBackIterator
 from jedi.evaluate import analysis
 from jedi.evaluate.lazy_context import LazyKnownContext, \
@@ -49,9 +50,12 @@ class ExecutedParam(object):
             # If we cannot infer annotations - or there aren't any - pretend
             # that the signature matches.
             return True
-        return any(c1.is_sub_class_of(c2)
-                   for c1 in argument_contexts
-                   for c2 in annotations)
+        matches = any(c1.is_sub_class_of(c2)
+                      for c1 in argument_contexts
+                      for c2 in annotations)
+        debug.dbg("signature compare %s: %s <=> %s",
+                  matches, argument_contexts, annotations, color='BLUE')
+        return matches
 
     @property
     def var_args(self):