diff --git a/jedi/api/classes.py b/jedi/api/classes.py
index 9602e04a..b04323b1 100644
--- a/jedi/api/classes.py
+++ b/jedi/api/classes.py
@@ -15,6 +15,7 @@ from jedi.evaluate import compiled
 from jedi.evaluate.imports import ImportName
 from jedi.evaluate.context import instance
 from jedi.evaluate.context import ClassContext, FunctionExecutionContext
+from jedi.plugins.typeshed import StubOnlyModuleContext
 from jedi.api.keywords import KeywordName
 
 
@@ -203,6 +204,10 @@ class BaseDefinition(object):
 
     def in_builtin_module(self):
         """Whether this is a builtin module."""
+        print(self._module)
+        if isinstance(self._module, StubOnlyModuleContext):
+            return any(isinstance(context, compiled.CompiledObject)
+                       for context in self._module.non_stub_context_set)
         return isinstance(self._module, compiled.CompiledObject)
 
     @property
diff --git a/jedi/evaluate/context/typing.py b/jedi/evaluate/context/typing.py
index 7471e9f7..2892cf9b 100644
--- a/jedi/evaluate/context/typing.py
+++ b/jedi/evaluate/context/typing.py
@@ -255,7 +255,6 @@ class TypeAlias(object):
         # There should only be one, because it's code that we control.
         assert len(classes) == 1, classes
         cls = next(iter(classes))
-        assert isinstance(cls, ClassContext), cls
         return cls
 
 
diff --git a/jedi/plugins/typeshed.py b/jedi/plugins/typeshed.py
index 4ec3b63d..58f68493 100644
--- a/jedi/plugins/typeshed.py
+++ b/jedi/plugins/typeshed.py
@@ -357,10 +357,10 @@ class StubFunctionContext(_MixedStubContextMixin, FunctionContext):
 class StubOnlyModuleContext(ModuleContext):
     def __init__(self, non_stub_context_set, *args, **kwargs):
         super(StubOnlyModuleContext, self).__init__(*args, **kwargs)
-        self._non_stub_context_set = non_stub_context_set
+        self.non_stub_context_set = non_stub_context_set
 
     def _get_first_non_stub_filters(self):
-        for context in self._non_stub_context_set:
+        for context in self.non_stub_context_set:
             yield next(context.get_filters(search_global=False))
 
     def get_filters(self, search_global, until_position=None,
diff --git a/test/test_api/test_api.py b/test/test_api/test_api.py
index 3cbac36a..e52d504d 100644
--- a/test/test_api/test_api.py
+++ b/test/test_api/test_api.py
@@ -5,17 +5,24 @@ Test all things related to the ``jedi.api`` module.
 import os
 from textwrap import dedent
 
-from jedi import preload_module
-from jedi._compatibility import is_py3
 from pytest import raises
 from parso import cache
 
+from jedi import preload_module
+from jedi._compatibility import is_py3
+from jedi.plugins import typeshed
+
 
 def test_preload_modules():
     def check_loaded(*modules):
         # +1 for None module (currently used)
         grammar_cache = next(iter(cache.parser_cache.values()))
-        assert len(grammar_cache) == len(modules) + 1
+        # Filter the typeshed parser cache.
+        typeshed_cache_count = sum(
+            1 for path in grammar_cache
+            if path is not None and path.startswith(typeshed._TYPESHED_PATH)
+        )
+        assert len(grammar_cache) - typeshed_cache_count == len(modules) + 1
         for i in modules:
             assert [i in k for k in grammar_cache.keys() if k is not None]
 
@@ -292,4 +299,4 @@ def test_goto_follow_builtin_imports(Script):
     d, = s.goto_assignments(follow_imports=True)
     assert d.in_builtin_module() is True
     d, = s.goto_assignments(follow_imports=True, follow_builtin_imports=True)
-    assert d.in_builtin_module() is False
+    assert d.in_builtin_module() is True
diff --git a/test/test_api/test_call_signatures.py b/test/test_api/test_call_signatures.py
index ccd8fb23..1f62b606 100644
--- a/test/test_api/test_call_signatures.py
+++ b/test/test_api/test_call_signatures.py
@@ -6,6 +6,7 @@ import pytest
 
 from ..helpers import TestCase
 from jedi import cache
+from jedi.parser_utils import get_call_signature
 from jedi._compatibility import is_py3
 
 
@@ -229,7 +230,15 @@ def test_complex(Script):
                 re.compile(
                 return it * 2
         """
-    assert_signature(Script, s, 'compile', 0, line=4, column=27)
+    sig1, sig2 = sorted(Script(s, line=4, column=27).call_signatures(), key=lambda s: s.line)
+    assert sig1.name == sig2.name == 'compile'
+    assert sig1.index == sig2.index == 0
+    func1, = sig1._name.infer()
+    func2, = sig2._name.infer()
+    assert get_call_signature(func1.tree_node) \
+        == 'compile(pattern: AnyStr, flags: _FlagsType = ...) -> Pattern[AnyStr]'
+    assert get_call_signature(func2.tree_node) \
+        == 'compile(pattern: Pattern[AnyStr], flags: _FlagsType = ...) ->\nPattern[AnyStr]'
 
     # jedi-vim #70
     s = """def foo("""
diff --git a/test/test_api/test_usages.py b/test/test_api/test_usages.py
index fdac5ccf..65c0a588 100644
--- a/test/test_api/test_usages.py
+++ b/test/test_api/test_usages.py
@@ -8,7 +8,7 @@ def test_exclude_builtin_modules(Script):
         return [(d.line, d.column) for d in Script(source, column=8).usages(include_builtins=include)]
     source = '''import sys\nprint(sys.path)'''
     places = get(include=True)
-    assert places == [(None, None), (1, 7), (2, 6)]
+    assert places == [(1, 7), (2, 6)]
 
     places = get(include=False)
     assert places == [(1, 7), (2, 6)]