fix: charmlib typing

charmcraft/models/project.py

@@ -92,6 +92,7 @@ class CharmLib(models.CraftBaseModel):
         title="Version filter for the charm. Either an API version or a specific [api].[patch].",
         pattern=r"[0-9]+(\.[0-9]+)?",
         coerce_numbers_to_str=False,
+        strict=True,
     )
 
     @pydantic.field_validator("lib", mode="before")
@@ -128,9 +129,11 @@ def _validate_api_version(cls, value: str) -> str:
         return str(value)
 
     @pydantic.field_validator("version", mode="before")
-    def _validate_patch_version(cls, value: str) -> str:
+    def _validate_patch_version(cls, value: str | float) -> str:
         """Validate the optional patch version, providing a useful error message."""
-        api, separator, patch = str(value).partition(".")
+        if not isinstance(value, str):
+            raise ValueError("Input should be a valid string")  # noqa: TRY004
+        api, separator, patch = value.partition(".")
         if not separator:
             return value
         try:

tests/unit/models/test_project.py

@@ -360,10 +360,10 @@ def test_invalid_patch_version(version: str):
 
 
 @pytest.mark.parametrize("version", [1, 1.1])
-def test_bad_version_type(version: str):
+def test_bad_version_type(version: Any):
     with pytest.raises(
         pydantic.ValidationError,
-        match="1 validation error for CharmLib\nversion\n  Input should be a valid string",
+        match="1 validation error for CharmLib\nversion\n.+Input should be a valid string",
     ):
         project.CharmLib(lib="charm_name.lib_name", version=version)