diff --git a/jaraco/compat/py.typed b/jaraco/compat/py.typed
new file mode 100644
index 0000000..e69de29
diff --git a/jaraco/compat/py38.py b/jaraco/compat/py38.py
index dccf064..4c398ad 100644
--- a/jaraco/compat/py38.py
+++ b/jaraco/compat/py38.py
@@ -12,33 +12,46 @@
 import functools
 import sys
 import types
+from typing import Protocol, cast
 
 
-def _fixer(orig: str):  # pragma: no cover
+class _RFixed(Protocol):
+    def removesuffix(self, suffix: str) -> str: ...
+    def removeprefix(self, prefix: str) -> str: ...
+
+
+def _fixer(orig: str) -> _RFixed:  # pragma: no cover
     """
     Return an object that implements removesuffix and removeprefix on orig.
     """
 
-    def removesuffix(suffix):
+    def removesuffix(suffix: str) -> str:
         # suffix='' should not call orig[:-0].
         if suffix and orig.endswith(suffix):
             return orig[: -len(suffix)]
         else:
             return orig[:]
 
-    def removeprefix(prefix):
+    def removeprefix(prefix: str) -> str:
         if orig.startswith(prefix):
             return orig[len(prefix) :]
         else:
             return orig[:]
 
-    return types.SimpleNamespace(removesuffix=removesuffix, removeprefix=removeprefix)
+    return cast(
+        _RFixed,
+        types.SimpleNamespace(removesuffix=removesuffix, removeprefix=removeprefix),
+    )
+
+
+def passthrough(orig: str) -> str:
+    return orig
 
 
-r_fix = _fixer if sys.version_info < (3, 9) else lambda x: x
+r_fix = _fixer if sys.version_info < (3, 9) else passthrough
 
 cache = (
-    functools.cache  # type: ignore[attr-defined]
+    functools.cache  # type: ignore[attr-defined, unused-ignore]
     if sys.version_info >= (3, 9)
     else functools.lru_cache(maxsize=None)
 )
diff --git a/mypy.ini b/mypy.ini
index 83b0d15..8ff26e4 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1,6 +1,6 @@
 [mypy]
 # Is the project well-typed?
-strict = False
+strict = True
 
 # Early opt-in even when strict = False
 warn_unused_ignores = True
diff --git a/pyproject.toml b/pyproject.toml
index d304e5d..703ae21 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -65,7 +65,3 @@ type = [
 
 
 [tool.setuptools_scm]
-
-
-[tool.pytest-enabler.mypy]
-# Disabled due to jaraco/skeleton#143