diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ffc29ad..c486556 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -152,9 +152,8 @@ jobs:
         run: pdm run make docs
 
       - name: Save PR number
-        env:
-          PR_NUMBER: ${{ github.event.number }}
-        run: echo $PR_NUMBER > .pr_number
+        run: |
+          echo "${{ github.event.number }}" > .pr_number
 
       - name: Upload artifact
         uses: actions/upload-artifact@v3
diff --git a/.github/workflows/docs-preview.yml b/.github/workflows/docs-preview.yml
index 5fdd985..5c30fef 100644
--- a/.github/workflows/docs-preview.yml
+++ b/.github/workflows/docs-preview.yml
@@ -29,8 +29,14 @@ jobs:
           path: docs-preview
           name: docs-preview
 
-      - name: Set PR number
-        run: echo "PR_NUMBER=$(cat docs-preview/.pr_number)" >> $GITHUB_ENV
+      - name: Validate and set PR number
+        run: |
+          PR_NUMBER=$(cat docs-preview/.pr_number)
+          if ! [[ "$PR_NUMBER" =~ ^[0-9]+$ ]]; then
+            echo "Invalid PR number: $PR_NUMBER"
+            exit 1
+          fi
+          echo "PR_NUMBER=$PR_NUMBER" >> $GITHUB_ENV
 
       - name: Deploy docs preview
         uses: JamesIves/github-pages-deploy-action@v4
diff --git a/pyproject.toml b/pyproject.toml
index 09d5e4d..cf8f1cd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,7 @@ classifiers = [
     "Intended Audience :: Developers",
 ]
 name = "type-lens"
-version = "0.2.2"
+version = "0.2.3"
 description = "type-lens is a Python template project designed to simplify the setup of a new project."
 readme = "README.md"
 license = { text = "MIT" }
diff --git a/tests/test_callable_view.py b/tests/test_callable_view.py
index 5804f75..0b67ba9 100644
--- a/tests/test_callable_view.py
+++ b/tests/test_callable_view.py
@@ -47,7 +47,7 @@ def fn(foo):  # type: ignore[no-untyped-def]
         return foo
 
     function_view = CallableView.from_callable(fn)
-    assert function_view.parameters == (ParameterView("foo", TypeView(Any)),)
+    assert function_view.parameters == (ParameterView("foo", TypeView(Any), has_annotation=False),)
 
 
 def test_typed_param() -> None:
diff --git a/type_lens/parameter_view.py b/type_lens/parameter_view.py
index ad2b85f..22dd39d 100644
--- a/type_lens/parameter_view.py
+++ b/type_lens/parameter_view.py
@@ -23,18 +23,35 @@ class ParameterView:
         "name": "The name of the parameter.",
         "default": "The default value of the parameter.",
         "type_view": "View of the parameter's annotation type.",
+        "has_annotation": (
+            "Whether the parameter had an annotation or not. Lack of an annotation implies "
+            "`TypeView(Any)`, but that is distinct from being explicitly `Any` annotated."
+        ),
     }
 
-    def __init__(self, name: str, type_view: TypeView = _any_type_view, *, default: Any | EmptyType = Empty) -> None:
+    def __init__(
+        self,
+        name: str,
+        type_view: TypeView = _any_type_view,
+        *,
+        default: Any | EmptyType = Empty,
+        has_annotation: bool = True,
+    ) -> None:
         self.name: Final = name
         self.type_view: Final = type_view
         self.default: Final = default
+        self.has_annotation: Final = has_annotation
 
     def __eq__(self, other: object) -> bool:
         if not isinstance(other, ParameterView):
             return False
 
-        return bool(self.name == other.name and self.type_view == other.type_view and self.default == other.default)
+        return bool(
+            self.name == other.name
+            and self.type_view == other.type_view
+            and self.default == other.default
+            and self.has_annotation == other.has_annotation
+        )
 
     def __repr__(self) -> str:
         cls_name = self.__class__.__name__
@@ -68,5 +85,6 @@ def from_parameter(cls, parameter: Parameter, fn_type_hints: dict[str, Any]) ->
         return cls(
             name=parameter.name,
             default=Empty if parameter.default is Signature.empty else parameter.default,
+            has_annotation=parameter.annotation is not Signature.empty,
             type_view=TypeView(annotation),
         )