diff --git a/rust/hg-core/src/lib.rs b/rust/hg-core/src/lib.rs
--- a/rust/hg-core/src/lib.rs
+++ b/rust/hg-core/src/lib.rs
@@ -26,11 +26,10 @@
 pub mod operations;
 pub mod utils;
 
-// Remove this to see (potential) non-artificial compile failures. MacOS
-// *should* compile, but fail to compile tests for example as of 2020-03-06
-#[cfg(not(target_os = "linux"))]
+// Remove this to see (potential) non-artificial compile failures.
+#[cfg(not(any(target_os = "linux", target_os = "macos")))]
 compile_error!(
-    "`hg-core` has only been tested on Linux and will most \
+    "`hg-core` has only been tested on Linux and macOS and will most \
      likely not behave correctly on other platforms."
 );
 
diff --git a/rust/hg-cpython/src/dirstate/dirstate_map.rs b/rust/hg-cpython/src/dirstate/dirstate_map.rs
--- a/rust/hg-cpython/src/dirstate/dirstate_map.rs
+++ b/rust/hg-cpython/src/dirstate/dirstate_map.rs
@@ -350,8 +350,8 @@
         {
             dict.set_item(
                 py,
-                key.as_bytes().to_vec(),
-                value.as_bytes().to_vec(),
+                PyBytes::new(py, key.as_bytes()).into_object(),
+                PyBytes::new(py, value.as_bytes()).into_object(),
             )?;
         }
         Ok(dict)