Small fixes

runtype/dataclass.py

@@ -23,6 +23,7 @@ def dataclass_transform(*a, **kw):
 from .common import CHECK_TYPES
 from .validation import TypeMismatchError, ensure_isa as default_ensure_isa
 from .pytypes import TypeCaster, SumType, NoneType, ATypeCaster, PythonType, type_caster
+from .utils import IS_BELOW_PY_310
 
 Required = object()
 Skip = object()
@@ -370,8 +371,11 @@ def __post_init__(self):
         # __init__ may have been generated by the dataclass function
         if hasattr(c, "__init__"):
             # We will add it to the dispatch
-            # c.__init__ = init_dispatcher(c.__init__)
-            c.__init__ = init_dispatcher(c.__init__.__get__(cls))
+            if IS_BELOW_PY_310:
+                # XXX Hack for old Python versions, to fix __qualname__
+                c.__init__ = init_dispatcher(c.__init__.__get__(cls))
+            else:
+                c.__init__ = init_dispatcher(c.__init__)
         else:
             c.__init__ = init_f
     return c

runtype/dispatch.py

@@ -6,7 +6,7 @@
 
 from dataclasses import dataclass
 
-from .utils import get_func_signatures
+from .utils import get_func_signatures, IS_BELOW_PY_310
 from .typesystem import TypeSystem
 
 
@@ -50,7 +50,8 @@ def __call__(self, func=None, *, priority=None):
                 "Must either provide a function to decorate, or set a priority"
             )
 
-        if hasattr(func, '__self__'):
+        if IS_BELOW_PY_310 and hasattr(func, '__self__'):
+            # XXX hack for old Python versions
             fname = func.__self__.__qualname__ + "." + func.__name__
             func = func.__func__
         else:

runtype/utils.py

@@ -1,7 +1,10 @@
+import sys
 import inspect
 import contextvars
 from contextlib import contextmanager
 
+IS_BELOW_PY_310 = sys.version_info < (3, 10)
+
 def get_func_signatures(typesystem, f):
     sig = inspect.signature(f)
     typesigs = []