diff --git a/OMPython/ModelicaSystem.py b/OMPython/ModelicaSystem.py
index 058c9d8b..bed1ed8f 100644
--- a/OMPython/ModelicaSystem.py
+++ b/OMPython/ModelicaSystem.py
@@ -345,7 +345,7 @@ def __init__(
 
         self._quantities: list[dict[str, Any]] = []
         self._params: dict[str, str] = {}  # even numerical values are stored as str
-        self._inputs: dict[str, list | None] = {}
+        self._inputs: dict[str, list[tuple[float, float]]] = {}
         # _outputs values are str before simulate(), but they can be
         # np.float64 after simulate().
         self._outputs: dict[str, Any] = {}
@@ -354,8 +354,15 @@ def __init__(
         self._simulate_options: dict[str, str] = {}
         self._override_variables: dict[str, str] = {}
         self._simulate_options_override: dict[str, str] = {}
-        self._linearization_options = {'startTime': 0.0, 'stopTime': 1.0, 'stepSize': 0.002, 'tolerance': 1e-8}
-        self._optimization_options = self._linearization_options | {'numberOfIntervals': 500}
+        self._linearization_options: dict[str, str | float] = {
+            'startTime': 0.0,
+            'stopTime': 1.0,
+            'stepSize': 0.002,
+            'tolerance': 1e-8,
+        }
+        self._optimization_options = self._linearization_options | {
+            'numberOfIntervals': 500,
+        }
         self._linearized_inputs: list[str] = []  # linearization input list
         self._linearized_outputs: list[str] = []  # linearization output list
         self._linearized_states: list[str] = []  # linearization states list
@@ -695,7 +702,10 @@ def getQuantities(self, names: Optional[str | list[str]] = None) -> list[dict]:
 
         raise ModelicaSystemError("Unhandled input for getQuantities()")
 
-    def getContinuous(self, names: Optional[str | list[str]] = None):
+    def getContinuous(
+            self,
+            names: Optional[str | list[str]] = None,
+    ) -> dict[str, str | numbers.Real] | list[str | numbers.Real]:
         """Get values of continuous signals.
 
         If called before simulate(), the initial values are returned as
@@ -767,7 +777,10 @@ def getContinuous(self, names: Optional[str | list[str]] = None):
 
         raise ModelicaSystemError("Unhandled input for getContinous()")
 
-    def getParameters(self, names: Optional[str | list[str]] = None) -> dict[str, str] | list[str]:  # 5
+    def getParameters(
+            self,
+            names: Optional[str | list[str]] = None,
+    ) -> dict[str, str] | list[str]:
         """Get parameter values.
 
         Args:
@@ -798,7 +811,10 @@ def getParameters(self, names: Optional[str | list[str]] = None) -> dict[str, st
 
         raise ModelicaSystemError("Unhandled input for getParameters()")
 
-    def getInputs(self, names: Optional[str | list[str]] = None) -> dict | list:  # 6
+    def getInputs(
+            self,
+            names: Optional[str | list[str]] = None,
+    ) -> dict[str, list[tuple[float, float]]] | list[list[tuple[float, float]]]:
         """Get values of input signals.
 
         Args:
@@ -832,7 +848,10 @@ def getInputs(self, names: Optional[str | list[str]] = None) -> dict | list:  #
 
         raise ModelicaSystemError("Unhandled input for getInputs()")
 
-    def getOutputs(self, names: Optional[str | list[str]] = None):  # 7
+    def getOutputs(
+            self,
+            names: Optional[str | list[str]] = None,
+    ) -> dict[str, str | numbers.Real] | list[str | numbers.Real]:
         """Get values of output signals.
 
         If called before simulate(), the initial values are returned as
@@ -900,7 +919,10 @@ def getOutputs(self, names: Optional[str | list[str]] = None):  # 7
 
         raise ModelicaSystemError("Unhandled input for getOutputs()")
 
-    def getSimulationOptions(self, names: Optional[str | list[str]] = None) -> dict[str, str] | list[str]:
+    def getSimulationOptions(
+            self,
+            names: Optional[str | list[str]] = None,
+    ) -> dict[str, str] | list[str]:
         """Get simulation options such as stopTime and tolerance.
 
         Args:
@@ -934,7 +956,10 @@ def getSimulationOptions(self, names: Optional[str | list[str]] = None) -> dict[
 
         raise ModelicaSystemError("Unhandled input for getSimulationOptions()")
 
-    def getLinearizationOptions(self, names: Optional[str | list[str]] = None) -> dict | list:
+    def getLinearizationOptions(
+            self,
+            names: Optional[str | list[str]] = None,
+    ) -> dict[str, str | float] | list[str | float]:
         """Get simulation options used for linearization.
 
         Args:
@@ -969,7 +994,10 @@ def getLinearizationOptions(self, names: Optional[str | list[str]] = None) -> di
 
         raise ModelicaSystemError("Unhandled input for getLinearizationOptions()")
 
-    def getOptimizationOptions(self, names: Optional[str | list[str]] = None) -> dict | list:
+    def getOptimizationOptions(
+            self,
+            names: Optional[str | list[str]] = None,
+    ) -> dict[str, str | float] | list[str | float]:
         """Get simulation options used for optimization.
 
         Args:
@@ -1084,7 +1112,7 @@ def simulate_cmd(
 
     def simulate(
             self,
-            resultfile: Optional[str] = None,
+            resultfile: Optional[str | os.PathLike] = None,
             simflags: Optional[str] = None,
             simargs: Optional[dict[str, Optional[str | dict[str, Any] | numbers.Number]]] = None,
             timeout: Optional[float] = None,
@@ -1783,9 +1811,9 @@ def linearize(
                     continue
 
                 target = body_part.targets[0].id  # type: ignore
-                value = ast.literal_eval(body_part.value)
+                value_ast = ast.literal_eval(body_part.value)
 
-                linear_data[target] = value
+                linear_data[target] = value_ast
         except (AttributeError, IndexError, ValueError, SyntaxError, TypeError) as ex:
             raise ModelicaSystemError(f"Error parsing linearization file {linear_file}!") from ex
 
diff --git a/OMPython/py.typed b/OMPython/py.typed
new file mode 100644
index 00000000..e69de29b
diff --git a/pyproject.toml b/pyproject.toml
index e82745c9..70708682 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,6 +25,9 @@ dependencies = [
 [tool.setuptools]
 packages = ["OMPython"]
 
+[tool.setuptools.package-data]
+"OMPython" = ["py.typed"]
+
 [project.urls]
 Homepage = "http://openmodelica.org/"
 Documentation = "https://openmodelica.org/doc/OpenModelicaUsersGuide/latest/ompython.html"