Assorted updates to the abi3 branch from review

Cargo.toml

@@ -35,7 +35,8 @@ rustversion = "1.0"
 [features]
 default = ["macros"]
 macros = ["ctor", "indoc", "inventory", "paste", "pyo3cls", "unindent"]
-# Use only limited API. See https://www.python.org/dev/peps/pep-0384/ for more.
+# Use the Python limited API. See https://www.python.org/dev/peps/pep-0384/ for
+# more.
 abi3 = []
 
 # Optimizes PyObject to Vec conversion and so on.

examples/rustapi_module/tests/test_datetime.py

@@ -328,5 +328,5 @@ def test_tz_class_introspection():
     tzi = rdt.TzClass()
 
     assert tzi.__class__ == rdt.TzClass
-    # PyPy generate <importlib.bootstrap.TzClass ...> for some reason.
+    # PyPy generates <importlib.bootstrap.TzClass ...> for some reason.
     assert re.match(r"^<[\w\.]*TzClass object at", repr(tzi))

guide/src/class.md

@@ -266,7 +266,7 @@ impl SubSubClass {
 ```
 
 You can also inherit native types such as `PyDict`, if they implement
-[`PySizedLayout`](https://docs.rs/pyo3/latest/pyo3/type_object/trait.PySizedLayout.html).
+[`PySizedLayout`](https://docs.rs/pyo3/latest/pyo3/type_object/trait.PySizedLayout.html). However, this is not supported when building for the Python limited API (aka the `abi3` feature of PyO3).
 
 However, because of some technical problems, we don't currently provide safe upcasting methods for types
 that inherit native types. Even in such cases, you can unsafely get a base class by raw pointer conversion.

tests/test_text_signature.rs

@@ -32,7 +32,7 @@ fn class_with_docs() {
 }
 
 #[test]
-#[cfg_attr(Py_LIMITED_API, ignore)]
+#[cfg_attr(all(Py_LIMITED_API, not(Py_3_10)), ignore)]
 fn class_with_docs_and_signature() {
     /// docs line1
     #[pyclass]
@@ -68,7 +68,7 @@ fn class_with_docs_and_signature() {
 }
 
 #[test]
-#[cfg_attr(Py_LIMITED_API, ignore)]
+#[cfg_attr(all(Py_LIMITED_API, not(Py_3_10)), ignore)]
 fn class_with_signature() {
     #[pyclass]
     #[text_signature = "(a, b=None, *, c=42)"]

tests/ui/abi3_nativetype_inheritance.rs

@@ -1,4 +1,4 @@
-//! With abi3, we cannot inherite native types.
+//! With abi3, we cannot inherit native types.
 use pyo3::prelude::*;
 use pyo3::types::PyDict;