Remove attempt to canonicalize the version. It's already canonical en…

…ough.

Closes #4302
Closes #3593

newsfragments/4302.bugfix.rst

@@ -0,0 +1 @@
+Remove attempt to canonicalize the version. It's already canonical enough.

setuptools/_core_metadata.py

@@ -17,7 +17,7 @@
 from . import _normalization, _reqs
 from .extern.packaging.markers import Marker
 from .extern.packaging.requirements import Requirement
-from .extern.packaging.utils import canonicalize_name, canonicalize_version
+from .extern.packaging.utils import canonicalize_name
 from .extern.packaging.version import Version
 from .warnings import SetuptoolsDeprecationWarning
 
@@ -264,5 +264,5 @@ def _write_provides_extra(file, processed_extras, safe, unsafe):
 def get_fullname(self):
     return "{}-{}".format(
         canonicalize_name(self.get_name()).replace('-', '_'),
-        canonicalize_version(self.get_version()),
+        self.get_version(),
     )

setuptools/tests/test_config_discovery.py

@@ -255,7 +255,7 @@ def test_py_modules_when_wheel_dir_is_cwd(self, tmp_path):
 
 
 class TestNoConfig:
-    CANONICAL_DEFAULT_VERSION = "0"  # Canonical default version given by setuptools
+    DEFAULT_VERSION = "0.0.0"  # Default version given by setuptools
 
     EXAMPLES = {
         "pkg1": ["src/pkg1.py"],
@@ -277,9 +277,7 @@ def test_build_with_discovered_name(self, tmp_path):
         _populate_project_dir(tmp_path, files, {})
         _run_build(tmp_path, "--sdist")
         # Expected distribution file
-        dist_file = (
-            tmp_path / f"dist/ns_nested_pkg-{self.CANONICAL_DEFAULT_VERSION}.tar.gz"
-        )
+        dist_file = tmp_path / f"dist/ns_nested_pkg-{self.DEFAULT_VERSION}.tar.gz"
         assert dist_file.is_file()