diff --git a/src/ffi/python/controllers.rs b/src/ffi/python/controllers.rs
index 50718af..334abdd 100644
--- a/src/ffi/python/controllers.rs
+++ b/src/ffi/python/controllers.rs
@@ -72,9 +72,8 @@ impl BufferController {
 	}
 
 	#[pyo3(name = "ack")]
-	fn pyack(&self, py: Python, v: Vec<u64>) -> PyResult<()> {
-		let this = self.clone();
-		a_sync_allow_threads!(py, this.ack(v))
+	fn pyack(&self, py: Python, v: Vec<i64>) -> () {
+		self.ack(v)
 	}
 
 	#[pyo3(name = "send")]
diff --git a/src/ffi/python/mod.rs b/src/ffi/python/mod.rs
index f9f8963..4e6ecd1 100644
--- a/src/ffi/python/mod.rs
+++ b/src/ffi/python/mod.rs
@@ -279,14 +279,14 @@ impl TextChange {
 	) -> PyResult<Self> {
 		if let Some(kwds) = kwds {
 			Ok(Self {
-				start_idx,
-				end_idx,
+				start_idx: start,
+				end_idx: end,
 				content,
 			})
 		} else {
 			Ok(Self {
-				start_idx,
-				end_idx,
+				start_idx: start,
+				end_idx: end,
 				content,
 			})
 		}