diff --git a/dist/py/src/codemp/codemp.pyi b/dist/py/src/codemp/codemp.pyi
index 73bfa0b..94271ff 100644
--- a/dist/py/src/codemp/codemp.pyi
+++ b/dist/py/src/codemp/codemp.pyi
@@ -95,6 +95,8 @@ class TextChange:
 	end: int
 	content: str
 
+	def __new__(cls, *, start: int, end: int, content: str, **kwargs): ...
+
 	def is_delete(self)         -> bool: ...
 	def is_insert(self)         -> bool: ...
 	def is_empty(self)          -> bool: ...
@@ -118,8 +120,8 @@ class BufferController:
 	def content(self)                           -> Promise[str]: ...
 	def ack(self, v: list[int])                 -> None: ...
 	def send(self, op: TextChange)              -> None: ...
-	def try_recv(self)                          -> Promise[Optional[TextChange]]: ...
-	def recv(self)                              -> Promise[TextChange]: ...
+	def try_recv(self)                          -> Promise[Optional[BufferUpdate]]: ...
+	def recv(self)                              -> Promise[BufferUpdate]: ...
 	def poll(self)                              -> Promise[None]: ...
 	def callback(self,
 		cb: Callable[[BufferController], None]) -> None: ...
@@ -131,10 +133,19 @@ class Selection:
 	"""
 	An Editor agnostic cursor position representation
 	"""
-	start: Tuple[int, int]
-	end: Tuple[int, int]
+	start_row: int
+	start_col: int
+	end_row: int
+	end_col: int
 	buffer: str
 
+	def __new__(cls, *
+		start_row: int,
+		start_col: int,
+		end_row: int,
+		end_col: int,
+		buffer: str, **kwargs): ...
+
 class Cursor:
 	"""
 	A remote cursor event
diff --git a/src/ffi/python/controllers.rs b/src/ffi/python/controllers.rs
index 01b2cc5..334abdd 100644
--- a/src/ffi/python/controllers.rs
+++ b/src/ffi/python/controllers.rs
@@ -71,6 +71,11 @@ impl BufferController {
 		a_sync_allow_threads!(py, this.content().await)
 	}
 
+	#[pyo3(name = "ack")]
+	fn pyack(&self, py: Python, v: Vec<i64>) -> () {
+		self.ack(v)
+	}
+
 	#[pyo3(name = "send")]
 	fn pysend(&self, _py: Python, op: TextChange) -> PyResult<()> {
 		let this = self.clone();
diff --git a/src/ffi/python/mod.rs b/src/ffi/python/mod.rs
index a0f7b8e..4e6ecd1 100644
--- a/src/ffi/python/mod.rs
+++ b/src/ffi/python/mod.rs
@@ -227,39 +227,16 @@ impl Cursor {
 #[pymethods]
 impl Selection {
 	#[new]
-	#[pyo3(signature = (**kwds))]
-	pub fn py_new(kwds: Option<&Bound<'_, PyDict>>) -> PyResult<Self> {
+	#[pyo3(signature = (*, start_row, start_col, end_row, end_col, buffer, **kwds))]
+	pub fn py_new(
+		start_row: i32,
+		start_col: i32,
+		end_row: i32,
+		end_col: i32,
+		buffer: String,
+		kwds: Option<&Bound<'_, PyDict>>,
+	) -> PyResult<Self> {
 		if let Some(kwds) = kwds {
-			let start_row = if let Some(e) = kwds.get_item("start_row")? {
-				e.extract()?
-			} else {
-				0
-			};
-
-			let start_col = if let Some(e) = kwds.get_item("start_col")? {
-				e.extract()?
-			} else {
-				0
-			};
-
-			let end_row = if let Some(e) = kwds.get_item("end_row")? {
-				e.extract()?
-			} else {
-				0
-			};
-
-			let end_col = if let Some(e) = kwds.get_item("end_col")? {
-				e.extract()?
-			} else {
-				0
-			};
-
-			let buffer = if let Some(e) = kwds.get_item("buffer")? {
-				e.extract()?
-			} else {
-				String::default()
-			};
-
 			Ok(Self {
 				start_row,
 				start_col,
@@ -268,7 +245,13 @@ impl Selection {
 				buffer,
 			})
 		} else {
-			Ok(Self::default())
+			Ok(Self {
+				start_row,
+				start_col,
+				end_row,
+				end_col,
+				buffer,
+			})
 		}
 	}
 
@@ -287,34 +270,25 @@ impl BufferUpdate {
 #[pymethods]
 impl TextChange {
 	#[new]
-	#[pyo3(signature = (**kwds))]
-	pub fn py_new(kwds: Option<&Bound<'_, PyDict>>) -> PyResult<Self> {
+	#[pyo3(signature = (*, start, end, content, **kwds))]
+	pub fn py_new(
+		start: u32,
+		end: u32,
+		content: String,
+		kwds: Option<&Bound<'_, PyDict>>,
+	) -> PyResult<Self> {
 		if let Some(kwds) = kwds {
-			let start_idx = if let Some(e) = kwds.get_item("start")? {
-				e.extract()?
-			} else {
-				0
-			};
-
-			let end_idx = if let Some(e) = kwds.get_item("end")? {
-				e.extract()?
-			} else {
-				0
-			};
-
-			let content = if let Some(e) = kwds.get_item("content")? {
-				e.extract()?
-			} else {
-				String::default()
-			};
-
 			Ok(Self {
-				start_idx,
-				end_idx,
+				start_idx: start,
+				end_idx: end,
 				content,
 			})
 		} else {
-			Ok(Self::default())
+			Ok(Self {
+				start_idx: start,
+				end_idx: end,
+				content,
+			})
 		}
 	}