[Python] Update PyO3 from 0.27.2 to 0.28.2 (#4348)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: dbrattli

src/fable-library-py/Cargo.lock

@@ -12,7 +12,7 @@ name = "_core"
 crate-type = ["cdylib"]
 
 [dependencies]
-pyo3 = { version = "0.27.2", features = ["extension-module", "chrono"] }
+pyo3 = { version = "0.28.2", features = ["extension-module", "chrono"] }
 byteorder = "1.5.0"
 chrono = "0.4.42"
 regex = "1.12.1"

src/fable-library-py/Cargo.toml

@@ -16,7 +16,7 @@ use pyo3::{
 };
 use std::sync::{Arc, Mutex};
 
-#[pyclass(module = "fable", subclass)]
+#[pyclass(module = "fable", subclass, from_py_object)]
 #[derive(Clone, Debug)]
 
 pub struct FSharpArray {
@@ -480,7 +480,11 @@ impl FSharpArray {
     pub fn __iter__(slf: PyRef<'_, Self>, py: Python<'_>) -> PyResult<Py<PyAny>> {
         let len = slf.storage.len();
         // SAFETY: slf.as_ptr() is valid and from_borrowed_ptr increments refcount
-        let array: Py<FSharpArray> = unsafe { Py::from_borrowed_ptr(py, slf.as_ptr()) };
+        let array: Py<FSharpArray> = unsafe {
+            Bound::from_borrowed_ptr(py, slf.as_ptr())
+                .cast_into_unchecked::<FSharpArray>()
+        }
+        .unbind();
         let iter = FSharpArrayIter {
             array,
             index: 0,
@@ -496,7 +500,11 @@ impl FSharpArray {
     pub fn GetEnumerator(slf: PyRef<'_, Self>, py: Python<'_>, _unit: Option<&Bound<'_, PyAny>>) -> PyResult<Py<PyAny>> {
         let len = slf.storage.len();
         // SAFETY: slf.as_ptr() is valid and from_borrowed_ptr increments refcount
-        let array: Py<FSharpArray> = unsafe { Py::from_borrowed_ptr(py, slf.as_ptr()) };
+        let array: Py<FSharpArray> = unsafe {
+            Bound::from_borrowed_ptr(py, slf.as_ptr())
+                .cast_into_unchecked::<FSharpArray>()
+        }
+        .unbind();
         let enumerator = FSharpArrayEnumerator {
             array,
             index: -1, // Before first element
@@ -4377,7 +4385,7 @@ pub fn of_seq(
 }
 
 // Constructor class for array allocation
-#[pyclass(module = "fable")]
+#[pyclass(module = "fable", from_py_object)]
 #[derive(Clone)]
 struct FSharpCons {
     #[pyo3(get, set)]

src/fable-library-py/src/array.rs

@@ -10,7 +10,7 @@ use std::ops::Deref;
 // Macro to generate float wrapper types (Float32, Float64)
 macro_rules! float_variant {
     ($name:ident, $type:ty) => {
-        #[pyclass(module = "fable", frozen)]
+        #[pyclass(module = "fable", frozen, from_py_object)]
         #[derive(Clone, Copy)] // Floats are typically Copy
         pub struct $name(pub $type);
 

src/fable-library-py/src/floats.rs

@@ -204,7 +204,7 @@ macro_rules! integer_variant {
         /// - Full Python special method support
         /// - Type-safe operations with automatic conversions
         /// - Direct access to the underlying value via Deref
-        #[pyclass(module = "fable", frozen)]
+        #[pyclass(module = "fable", frozen, from_py_object)]
         #[derive(Clone)]
         pub struct $name(pub $type); // Make the inner field public
 

src/fable-library-py/src/ints.rs

@@ -107,7 +107,7 @@ mod printf {
     /// def fail(msg): raise Exception(msg)
     /// printf("Error: %s").cont(fail)("something went wrong")  # raises Exception
     /// ```
-    #[pyclass(module = "fable")]
+    #[pyclass(module = "fable", from_py_object)]
     pub struct IPrintfFormat {
         /// The original format string with placeholders
         input: String,
@@ -633,7 +633,7 @@ mod printf {
     }
 
     /// Console printer wrapper that maintains F# currying semantics
-    #[pyclass]
+    #[pyclass(from_py_object)]
     #[derive(Clone)]
     pub struct ConsolePrinter {
         format: IPrintfFormat,
@@ -1676,7 +1676,7 @@ mod formatting {
     }
 
     /// String comparison enumeration
-    #[pyclass(module = "fable")]
+    #[pyclass(module = "fable", from_py_object)]
     #[derive(Clone, Copy)]
     pub struct StringComparison {
         pub value: i32,