chore: checkpoint before Python removal

vendor/windows-core-0.58.0/src/param_value.rs

@@ -0,0 +1,24 @@
+use super::*;
+use core::mem::transmute_copy;
+
+#[doc(hidden)]
+pub enum ParamValue<T: Type<T>> {
+    Owned(T),
+    Borrowed(T::Abi),
+}
+
+impl<T: Type<T>> ParamValue<T> {
+    // TODO: replace with `borrow` in windows-bindgen
+    pub fn abi(&self) -> T::Abi {
+        unsafe {
+            match self {
+                Self::Owned(item) => transmute_copy(item),
+                Self::Borrowed(borrowed) => transmute_copy(borrowed),
+            }
+        }
+    }
+
+    pub fn borrow(&self) -> Ref<'_, T> {
+        unsafe { transmute_copy(&self.abi()) }
+    }
+}