diff --git a/server/Cargo.toml b/server/Cargo.toml
index 3c6ba83..8069561 100644
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -5,3 +5,4 @@ edition = "2021"
 
 [dependencies]
 polariton = { version = "0.1.0", path = "../" }
+log = "0.4"
diff --git a/server/src/operations/handler.rs b/server/src/operations/handler.rs
index 2d4493a..d303f96 100644
--- a/server/src/operations/handler.rs
+++ b/server/src/operations/handler.rs
@@ -46,7 +46,7 @@ impl <U: Send + Sync> OperationsHandler<U> {
     }
 
     pub fn with_state<S: Send + Sync + 'static, O: Operation<State=S, User=U> + OperationCode + 'static>(mut self, op: O, state: S) -> Self {
-        self.op_map.insert(O::op_code(), Box::new(SyncedOpWrapper {
+        self.insert_op(O::op_code(), Box::new(SyncedOpWrapper {
             state: Mutex::new(state),
             handler: op,
         }));
@@ -54,12 +54,18 @@ impl <U: Send + Sync> OperationsHandler<U> {
     }
 
     pub fn without_state<O: Operation<State=(), User=U> + OperationCode + 'static>(mut self, op: O) -> Self {
-        self.op_map.insert(O::op_code(), Box::new(StatelessOpWrapper {
+        self.insert_op(O::op_code(), Box::new(StatelessOpWrapper {
             handler: op,
         }));
         self
     }
 
+    fn insert_op(&mut self, code: u8, handler: Box<dyn WrappedOperation<U>>) {
+        if self.op_map.insert(code, handler).is_some() {
+            log::warn!("Replacing operation for code {}", code);
+        }
+    }
+
     fn try_pass_to_handler(&self, code: u8, params: ParameterTable, user:&U) -> OperationResponse {
         if let Some(handler) = self.op_map.get(&code) {
             handler.handle(params, user)
diff --git a/src/operation/mod.rs b/src/operation/mod.rs
index b1bcbf3..f80bd5f 100644
--- a/src/operation/mod.rs
+++ b/src/operation/mod.rs
@@ -24,3 +24,6 @@ pub use type_prefixed::Typed;
 
 mod typed_dict;
 pub use typed_dict::Dict;
+
+mod typed_arr;
+pub use typed_arr::Arr;
diff --git a/src/operation/type_prefixed.rs b/src/operation/type_prefixed.rs
index 02e6e65..6b7da60 100644
--- a/src/operation/type_prefixed.rs
+++ b/src/operation/type_prefixed.rs
@@ -41,7 +41,7 @@ pub enum Typed {
     #[brw(magic = 120u8)]
     Bytes(super::SizePrefixedVec<i32, u8>),
     #[brw(magic = 121u8)]
-    Arr(super::SizePrefixedVec<i16, Typed>),
+    Arr(super::Arr),
     #[brw(magic = 122u8)]
     ObjArr(super::SizePrefixedVec<i16, Typed>),
 }
diff --git a/src/operation/typed_arr.rs b/src/operation/typed_arr.rs
new file mode 100644
index 0000000..e5e32a5
--- /dev/null
+++ b/src/operation/typed_arr.rs
@@ -0,0 +1,49 @@
+use binrw::{BinRead, BinWrite};
+
+use super::Typed;
+
+#[derive(Debug, Clone)]
+pub struct Arr {
+    pub ty: u8,
+    pub items: Vec<Typed>,
+}
+
+impl BinRead for Arr {
+    type Args<'a> = ();
+
+    fn read_options<R: std::io::Read + std::io::Seek>(
+        reader: &mut R,
+        endian: binrw::Endian,
+        args: Self::Args<'_>,
+    ) -> binrw::BinResult<Self> {
+        let len = i16::read_options(reader, endian, args)?;
+        let ty = u8::read_options(reader, endian, args)?;
+        let mut items = Vec::with_capacity(len as _);
+        for _ in 0..len {
+            let item = Typed::with_magic(ty, reader)?;
+
+            items.push(item);
+        }
+        Ok(Self {
+            ty, items,
+        })
+    }
+}
+
+impl BinWrite for Arr {
+    type Args<'a> = ();
+
+    fn write_options<W: std::io::Write + std::io::Seek>(
+        &self,
+        writer: &mut W,
+        endian: binrw::Endian,
+        args: Self::Args<'_>,
+    ) -> binrw::BinResult<()> {
+        (self.items.len() as i16).write_options(writer, endian, args)?;
+        self.ty.write_options(writer, endian, args)?;
+        for item in &self.items {
+            item.write_inner(writer)?;
+        }
+        Ok(())
+    }
+}