All python components that wrap a bool now implement __bool__ (#5400)

### What

This fixes unexpected errors with python truthiness.

plus some mypy linting fixes for issues I encountered when running `pixi
run lint-py-mypy` on windows

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested the web demo (if applicable):
* Using newly built examples:
[app.rerun.io](https://app.rerun.io/pr/{{pr.number}}/index.html)
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[app.rerun.io](https://app.rerun.io/pr/{{pr.number}}/index.html?manifest_url=https://app.rerun.io/version/nightly/examples_manifest.json)
* [x] The PR title and labels are set such as to maximize their
usefulness for the next release's CHANGELOG
* [x] If applicable, add a new check to the [release
checklist](https://github.com/rerun-io/rerun/blob/main/tests/python/release_checklist)!

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crates/re_types_builder/src/codegen/python/mod.rs

@@ -633,6 +633,20 @@ fn code_for_struct(
         code.push_indented(1, quote_init_method(reporter, obj, ext_class, objects), 2);
     }
 
+    // Generate __bool__ operator if this is a single field struct with a bool field.
+    if fields.len() == 1 && fields[0].typ == Type::Bool {
+        code.push_indented(
+            1,
+            format!(
+                "def __bool__(self) -> bool:
+    return self.{}
+",
+                fields[0].name
+            ),
+            2,
+        );
+    }
+
     if obj.kind == ObjectKind::Archetype {
         code.push_indented(1, quote_clear_methods(obj), 2);
     }
@@ -722,7 +736,11 @@ fn code_for_struct(
 
         if *kind == ObjectKind::Archetype {
             code.push_indented(1, "__str__ = Archetype.__str__", 1);
-            code.push_indented(1, "__repr__ = Archetype.__repr__", 1);
+            code.push_indented(
+                1,
+                "__repr__ = Archetype.__repr__ # type: ignore[assignment] ",
+                1,
+            );
         }
 
         code.push_indented(1, quote_array_method_from_obj(ext_class, objects, obj), 1);

rerun_py/rerun_sdk/rerun/__init__.py

@@ -527,8 +527,9 @@ def _register_on_fork() -> None:
     try:
         import os
 
-        os.register_at_fork(after_in_child=cleanup_if_forked_child)
+        os.register_at_fork(after_in_child=cleanup_if_forked_child)  # type: ignore[attr-defined]
     except AttributeError:
+        # not defined on all OSes
         pass
 
 

rerun_py/tests/unit/test_clear.py

@@ -1,7 +1,8 @@
 from __future__ import annotations
 
+import numpy as np
 import rerun as rr
-from rerun.components import ClearIsRecursiveBatch
+from rerun.components import ClearIsRecursive, ClearIsRecursiveBatch
 
 
 def test_clear() -> None:
@@ -19,5 +20,15 @@ def test_clear_factory_methods() -> None:
     assert rr.Clear(recursive=False) == rr.Clear.flat()
 
 
+def test_truthiness() -> None:
+    assert ClearIsRecursive(recursive=True)
+    assert not ClearIsRecursive(recursive=False)
+
+    assert np.array_equal(
+        np.array([ClearIsRecursive(recursive=True), ClearIsRecursive(recursive=False)], dtype=np.bool_),
+        np.array([True, False], dtype=np.bool_),
+    )
+
+
 if __name__ == "__main__":
     test_clear()