Use collections.abc.Sequence instead of _Sequence alias in bpy.types

Same approach as fake-bpy-module: fully qualify all Sequence references
as collections.abc.Sequence to avoid shadowing by bpy.types.Sequence.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

generate_stubs.py

@@ -367,6 +367,26 @@ def generate_property_stub(
             result += f"{indent}    ...\n"
         return result
 
+    # Writable properties with different getter/setter types need @property
+    # (e.g. location: mathutils.Vector | Sequence[float] -> getter returns Vector,
+    # setter accepts both)
+    if " | " in prop["type"]:
+        parts_list = [p.strip() for p in prop["type"].split(" | ")]
+        getter_type = parts_list[0]
+        setter_type = prop["type"]
+        result = f"{indent}{property_decorator}\n"
+        result += f"{indent}def {prop['name']}(self) -> {getter_type}:\n"
+        if prop["description"]:
+            desc = prop["description"].replace("\\", "\\\\").replace('"""', r"\"\"\"")
+            if desc.endswith('"'):
+                desc += " "
+            result += f'{indent}    """{desc}"""\n'
+        else:
+            result += f"{indent}    ...\n"
+        result += f"{indent}@{prop['name']}.setter\n"
+        result += f"{indent}def {prop['name']}(self, value: {setter_type}) -> None: ...\n"
+        return result
+
     result = f"{indent}{prop['name']}: {prop['type']}\n"
     if prop["description"]:
         desc = prop["description"].replace("\\", "\\\\").replace('"""', r"\"\"\"")
@@ -577,11 +597,7 @@ def generate_types_stub(
         ),
     ]
     if "Sequence[" in all_type_strs:
-        # Use fully qualified import to avoid shadowing by bpy.types.Sequence
-        # (the video sequencer strip type)
-        imports.append("import collections")
         imports.append("import collections.abc")
-        imports.append("from collections.abc import Sequence as _Sequence")
     if "mathutils." in all_type_strs:
         imports.append("import mathutils")
 
@@ -612,8 +628,9 @@ def generate_types_stub(
     result = "\n".join(parts)
     class_names = {s["name"] for s in structs}
     result = strip_self_module_prefix(result, "bpy.types", class_names)
-    # Replace bare Sequence[ with _Sequence[ to avoid shadowing by bpy.types.Sequence
-    result = re.sub(r"(?<!\.)(?<!\w)\bSequence\[", "_Sequence[", result)
+    # Qualify all bare Sequence[ to collections.abc.Sequence[ to avoid
+    # shadowing by bpy.types.Sequence (the video sequencer strip type).
+    result = re.sub(r"(?<!\.)(?<!\w)\bSequence\[", "collections.abc.Sequence[", result)
     # Qualify bare "object" in type annotations to avoid shadowing by
     # properties named "object" (e.g. Context.object: Object).
     result = re.sub(r"(?<=: )object\b", "builtins.object", result)