diff --git a/.github/workflows/elixir.yml b/.github/workflows/elixir.yml
index 3c95007..ea6cf7d 100644
--- a/.github/workflows/elixir.yml
+++ b/.github/workflows/elixir.yml
@@ -41,3 +41,7 @@ jobs:
       run: mix deps.get
     - name: Run tests
       run: mix test
+    - name: format check
+      run: mix format --check-formatted
+    - name: Run credo
+      run: mix credo
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
new file mode 100644
index 0000000..4bb8de1
--- /dev/null
+++ b/.github/workflows/rust.yml
@@ -0,0 +1,25 @@
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'native/**'
+  pull_request:
+    paths:
+      - 'native/**'
+  workflow_dispatch:
+
+
+jobs:
+  lint:
+    name: Rust linter
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Run clippy
+      run: cargo clippy
+      working-directory: native/yex
+    - name: format check
+      run: cargo fmt --check
+      working-directory: native/yex
diff --git a/.gitignore b/.gitignore
index 2febb75..9559f57 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,4 +25,6 @@ y_ex-*.tar
 # Temporary files, for example, from tests.
 /tmp/
 
-priv/native/*.so
\ No newline at end of file
+priv/native/*.so
+
+checksum-*.exs
\ No newline at end of file
diff --git a/lib/array.ex b/lib/array.ex
index bc18463..5a78e95 100644
--- a/lib/array.ex
+++ b/lib/array.ex
@@ -1,4 +1,7 @@
 defmodule Yex.Array do
+  @moduledoc """
+  A shareable Array-like type that supports efficient insert/delete of elements at any position.
+  """
   defstruct [
     :reference
   ]
@@ -45,6 +48,18 @@ defmodule Yex.Array do
 end
 
 defmodule Yex.ArrayPrelim do
+  @moduledoc """
+  A preliminary array. It can be used to early initialize the contents of a Array.
+
+  ## Examples
+      iex> doc = Yex.Doc.new()
+      iex> map = Yex.Doc.get_map(doc, "map")
+      iex> Yex.Map.set(map, "key", Yex.ArrayPrelim.from(["Hello", "World"]))
+      iex> {:ok, %Yex.Array{} = array} = Yex.Map.get(map, "key")
+      iex> Yex.Array.get(array, 1)
+      {:ok, "World"}
+
+  """
   defstruct [
     :list
   ]
diff --git a/lib/doc.ex b/lib/doc.ex
index 673e651..f88a1c3 100644
--- a/lib/doc.ex
+++ b/lib/doc.ex
@@ -1,5 +1,8 @@
 defmodule Yex.Doc do
   defmodule Options do
+    @moduledoc """
+    Document options.
+    """
     defstruct client_id: 0,
               guid: nil,
               collection_id: nil,
diff --git a/lib/map.ex b/lib/map.ex
index 91d4339..43e45a0 100644
--- a/lib/map.ex
+++ b/lib/map.ex
@@ -1,4 +1,7 @@
 defmodule Yex.Map do
+  @moduledoc """
+  A shareable Map type.
+  """
   defstruct [
     :reference
   ]
@@ -33,6 +36,17 @@ defmodule Yex.Map do
 end
 
 defmodule Yex.MapPrelim do
+  @moduledoc """
+  A preliminary map. It can be used to early initialize the contents of a Map.
+
+  ## Examples
+      iex> doc = Yex.Doc.new()
+      iex> array = Yex.Doc.get_array(doc, "array")
+      iex> Yex.Array.insert(array, 0, Yex.MapPrelim.from(%{ "key" => "value" }))
+      iex> {:ok, %Yex.Map{} = map} = Yex.Array.get(array, 0)
+      iex> Yex.Map.get(map, "key")
+      {:ok, "value"}
+  """
   defstruct [
     :map
   ]
diff --git a/lib/nif.ex b/lib/nif.ex
index b45303a..87d1dcd 100644
--- a/lib/nif.ex
+++ b/lib/nif.ex
@@ -1,16 +1,16 @@
 defmodule Yex.Nif do
+  @moduledoc false
+  # Do not use directly
 
   version = Mix.Project.config()[:version]
 
   use RustlerPrecompiled,
     otp_app: :y_ex,
     crate: "yex",
-    base_url:
-      "https://github.com/satoren/y_ex/releases/download/v#{version}",
+    base_url: "https://github.com/satoren/y_ex/releases/download/v#{version}",
     force_build: System.get_env("RUSTLER_PRECOMPILATION_YEX_BUILD") in ["1", "true"],
     version: version
 
-
   def doc_new(), do: :erlang.nif_error(:nif_not_loaded)
   def doc_with_options(_option), do: :erlang.nif_error(:nif_not_loaded)
   def doc_get_or_insert_text(_doc, _name), do: :erlang.nif_error(:nif_not_loaded)
diff --git a/lib/text.ex b/lib/text.ex
index 0404c03..29a2eea 100644
--- a/lib/text.ex
+++ b/lib/text.ex
@@ -1,4 +1,7 @@
 defmodule Yex.Text do
+  @moduledoc """
+  A shareable type that is optimized for shared editing on text.
+  """
   defstruct [
     :reference
   ]
@@ -37,7 +40,6 @@ defmodule Yex.Text do
   end
 
   def to_json(%__MODULE__{} = _text) do
-    # todo: need to implement
     raise "Not implemented"
   end
 end
diff --git a/mix.exs b/mix.exs
index 4589de3..11db31e 100644
--- a/mix.exs
+++ b/mix.exs
@@ -1,7 +1,7 @@
 defmodule Yex.MixProject do
   use Mix.Project
 
-  @version "0.0.3"
+  @version "0.0.4"
   @repo "https://github.com/satoren/y_ex"
 
   @description """
@@ -51,7 +51,8 @@ defmodule Yex.MixProject do
     [
       {:rustler, ">= 0.0.0", optional: true},
       {:rustler_precompiled, "~> 0.7"},
-      {:ex_doc, "~> 0.29", only: :dev, runtime: false}
+      {:ex_doc, "~> 0.29", only: :dev, runtime: false},
+      {:credo, "~> 1.7", only: [:dev, :test], runtime: false}
     ]
   end
 end
diff --git a/mix.lock b/mix.lock
index 0eb40bd..beb0c7e 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,7 +1,10 @@
 %{
+  "bunt": {:hex, :bunt, "1.0.0", "081c2c665f086849e6d57900292b3a161727ab40431219529f13c4ddcf3e7a44", [:mix], [], "hexpm", "dc5f86aa08a5f6fa6b8096f0735c4e76d54ae5c9fa2c143e5a1fc7c1cd9bb6b5"},
   "castore": {:hex, :castore, "1.0.8", "dedcf20ea746694647f883590b82d9e96014057aff1d44d03ec90f36a5c0dc6e", [:mix], [], "hexpm", "0b2b66d2ee742cb1d9cb8c8be3b43c3a70ee8651f37b75a8b982e036752983f1"},
+  "credo": {:hex, :credo, "1.7.7", "771445037228f763f9b2afd612b6aa2fd8e28432a95dbbc60d8e03ce71ba4446", [:mix], [{:bunt, "~> 0.2.1 or ~> 1.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:file_system, "~> 0.2 or ~> 1.0", [hex: :file_system, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "8bc87496c9aaacdc3f90f01b7b0582467b69b4bd2441fe8aae3109d843cc2f2e"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.41", "ab34711c9dc6212dda44fcd20ecb87ac3f3fce6f0ca2f28d4a00e4154f8cd599", [:mix], [], "hexpm", "a81a04c7e34b6617c2792e291b5a2e57ab316365c2644ddc553bb9ed863ebefa"},
   "ex_doc": {:hex, :ex_doc, "0.34.2", "13eedf3844ccdce25cfd837b99bea9ad92c4e511233199440488d217c92571e8", [:mix], [{:earmark_parser, "~> 1.4.39", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_c, ">= 0.1.0", [hex: :makeup_c, repo: "hexpm", optional: true]}, {:makeup_elixir, "~> 0.14 or ~> 1.0", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1 or ~> 1.0", [hex: :makeup_erlang, repo: "hexpm", optional: false]}, {:makeup_html, ">= 0.1.0", [hex: :makeup_html, repo: "hexpm", optional: true]}], "hexpm", "5ce5f16b41208a50106afed3de6a2ed34f4acfd65715b82a0b84b49d995f95c1"},
+  "file_system": {:hex, :file_system, "1.0.0", "b689cc7dcee665f774de94b5a832e578bd7963c8e637ef940cd44327db7de2cd", [:mix], [], "hexpm", "6752092d66aec5a10e662aefeed8ddb9531d79db0bc145bb8c40325ca1d8536d"},
   "jason": {:hex, :jason, "1.4.3", "d3f984eeb96fe53b85d20e0b049f03e57d075b5acda3ac8d465c969a2536c17b", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "9a90e868927f7c777689baa16d86f4d0e086d968db5c05d917ccff6d443e58a3"},
   "makeup": {:hex, :makeup, "1.1.2", "9ba8837913bdf757787e71c1581c21f9d2455f4dd04cfca785c70bbfff1a76a3", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "cce1566b81fbcbd21eca8ffe808f33b221f9eee2cbc7a1706fc3da9ff18e6cac"},
   "makeup_elixir": {:hex, :makeup_elixir, "0.16.2", "627e84b8e8bf22e60a2579dad15067c755531fea049ae26ef1020cad58fe9578", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "41193978704763f6bbe6cc2758b84909e62984c7752b3784bd3c218bb341706b"},
diff --git a/native/yex/src/any.rs b/native/yex/src/any.rs
index 2d535d0..6df8c8a 100644
--- a/native/yex/src/any.rs
+++ b/native/yex/src/any.rs
@@ -63,7 +63,7 @@ fn decode<'a>(term: Term<'a>) -> NifResult<Any> {
         return Ok(Any::from(a));
     }
 
-    return Err(rustler::Error::BadArg);
+    Err(rustler::Error::BadArg)
 }
 
 pub type NifAny = NifWrap<Any>;
diff --git a/native/yex/src/array.rs b/native/yex/src/array.rs
index a376375..1bc99a6 100644
--- a/native/yex/src/array.rs
+++ b/native/yex/src/array.rs
@@ -23,14 +23,14 @@ pub struct NifArray {
 impl NifArray {
     pub fn new(doc: ResourceArc<DocResource>, array: ArrayRef) -> Self {
         NifArray {
-            doc: doc,
+            doc,
             reference: ResourceArc::new(array.into()),
         }
     }
 
     pub fn insert(&self, index: u32, input: NifYInput) -> Result<(), NifError> {
-        if let Some(mut txn) = self.doc.current_transaction.borrow_mut().as_mut() {
-            self.reference.insert(&mut txn, index, input);
+        if let Some(txn) = self.doc.current_transaction.borrow_mut().as_mut() {
+            self.reference.insert(txn, index, input);
             Ok(())
         } else {
             let mut txn = self.doc.0.doc.transact_mut();
diff --git a/native/yex/src/doc.rs b/native/yex/src/doc.rs
index a41215a..7c9c841 100644
--- a/native/yex/src/doc.rs
+++ b/native/yex/src/doc.rs
@@ -74,15 +74,15 @@ impl From<NifOptions> for Options {
         } else {
             uuid_v4()
         };
-        return Options {
+        Options {
             client_id: w.client_id,
-            guid: guid,
+            guid,
             collection_id: w.collection_id,
-            offset_kind: offset_kind,
+            offset_kind,
             skip_gc: w.skip_gc,
             auto_load: w.auto_load,
             should_load: w.should_load,
-        };
+        }
     }
 }
 
@@ -107,7 +107,7 @@ impl NifDoc {
         NifDoc {
             reference: ResourceArc::new(
                 DocInner {
-                    doc: doc,
+                    doc,
                     current_transaction: RefCell::new(None),
                 }
                 .into(),
@@ -148,7 +148,7 @@ impl NifDoc {
         Ok(())
     }
 
-    pub fn commit_transaction(&self) -> () {
+    pub fn commit_transaction(&self) {
         *self.reference.current_transaction.borrow_mut() = None;
     }
 
diff --git a/native/yex/src/error.rs b/native/yex/src/error.rs
index f6fcbe1..05c31a8 100644
--- a/native/yex/src/error.rs
+++ b/native/yex/src/error.rs
@@ -9,9 +9,9 @@ pub struct NifError {
 
 impl From<yrs::doc::TransactionAcqError> for NifError {
     fn from(w: yrs::doc::TransactionAcqError) -> NifError {
-        return NifError {
+        NifError {
             reason: atoms::transaction_acq_error(),
             message: w.to_string(),
-        };
+        }
     }
 }
diff --git a/native/yex/src/lib.rs b/native/yex/src/lib.rs
index d1edaf0..6c291d1 100644
--- a/native/yex/src/lib.rs
+++ b/native/yex/src/lib.rs
@@ -84,17 +84,17 @@ fn doc_with_options(option: NifOptions) -> NifDoc {
 }
 
 #[rustler::nif]
-fn doc_get_or_insert_text<'a>(env: Env<'a>, doc: NifDoc, name: &str) -> NifText {
+fn doc_get_or_insert_text(env: Env<'_>, doc: NifDoc, name: &str) -> NifText {
     ENV.set(&mut env.clone(), || doc.get_or_insert_text(name))
 }
 
 #[rustler::nif]
-fn doc_get_or_insert_array<'a>(env: Env<'a>, doc: NifDoc, name: &str) -> NifArray {
+fn doc_get_or_insert_array(env: Env<'_>, doc: NifDoc, name: &str) -> NifArray {
     ENV.set(&mut env.clone(), || doc.get_or_insert_array(name))
 }
 
 #[rustler::nif]
-fn doc_get_or_insert_map<'a>(env: Env<'a>, doc: NifDoc, name: &str) -> NifMap {
+fn doc_get_or_insert_map(env: Env<'_>, doc: NifDoc, name: &str) -> NifMap {
     ENV.set(&mut env.clone(), || doc.get_or_insert_map(name))
 }
 
@@ -108,7 +108,7 @@ fn doc_begin_transaction(doc: NifDoc, origin: Option<&str>) -> Result<(), NifErr
 }
 
 #[rustler::nif]
-fn doc_commit_transaction<'a>(env: Env<'a>, doc: NifDoc) -> () {
+fn doc_commit_transaction(env: Env<'_>, doc: NifDoc) {
     ENV.set(&mut env.clone(), || doc.commit_transaction())
 }
 
@@ -128,13 +128,13 @@ fn doc_monitor_update_v2(
 }
 
 #[rustler::nif]
-fn text_insert<'a>(env: Env<'a>, text: NifText, index: u32, chunk: &str) -> Result<(), NifError> {
+fn text_insert(env: Env<'_>, text: NifText, index: u32, chunk: &str) -> Result<(), NifError> {
     ENV.set(&mut env.clone(), || text.insert(index, chunk))
 }
 
 #[rustler::nif]
-fn text_insert_with_attributes<'a>(
-    env: Env<'a>,
+fn text_insert_with_attributes(
+    env: Env<'_>,
     text: NifText,
     index: u32,
     chunk: &str,
@@ -146,13 +146,13 @@ fn text_insert_with_attributes<'a>(
 }
 
 #[rustler::nif]
-fn text_delete<'a>(env: Env<'a>, text: NifText, index: u32, len: u32) -> Result<(), NifError> {
+fn text_delete(env: Env<'_>, text: NifText, index: u32, len: u32) -> Result<(), NifError> {
     ENV.set(&mut env.clone(), || text.delete(index, len))
 }
 
 #[rustler::nif]
-fn text_format<'a>(
-    env: Env<'a>,
+fn text_format(
+    env: Env<'_>,
     text: NifText,
     index: u32,
     len: u32,
@@ -171,8 +171,8 @@ fn text_length(text: NifText) -> u32 {
 }
 
 #[rustler::nif]
-fn array_insert<'a>(
-    env: Env<'a>,
+fn array_insert(
+    env: Env<'_>,
     array: NifArray,
     index: u32,
     value: NifYInput,
@@ -188,8 +188,8 @@ fn array_get(array: NifArray, index: u32) -> Result<NifValue, NifError> {
     array.get(index)
 }
 #[rustler::nif]
-fn array_delete_range<'a>(
-    env: Env<'a>,
+fn array_delete_range(
+    env: Env<'_>,
     array: NifArray,
     index: u32,
     length: u32,
@@ -206,7 +206,7 @@ fn array_to_json(array: NifArray) -> NifAny {
 }
 
 #[rustler::nif]
-fn map_set<'a>(env: Env<'a>, map: NifMap, key: &str, value: NifYInput) -> Result<(), NifError> {
+fn map_set(env: Env<'_>, map: NifMap, key: &str, value: NifYInput) -> Result<(), NifError> {
     ENV.set(&mut env.clone(), || map.set(key, value))
 }
 #[rustler::nif]
@@ -218,7 +218,7 @@ fn map_get(map: NifMap, key: &str) -> Result<NifValue, NifError> {
     map.get(key)
 }
 #[rustler::nif]
-fn map_delete<'a>(env: Env<'a>, map: NifMap, key: &str) -> Result<(), NifError> {
+fn map_delete(env: Env<'_>, map: NifMap, key: &str) -> Result<(), NifError> {
     ENV.set(&mut env.clone(), || map.delete(key))
 }
 #[rustler::nif]
@@ -231,10 +231,7 @@ fn map_to_json(map: NifMap) -> NifAny {
 }
 
 #[rustler::nif]
-fn sub_unsubscribe<'a>(
-    env: Env<'a>,
-    sub: ResourceArc<SubscriptionResource>,
-) -> Result<(), NifError> {
+fn sub_unsubscribe(env: Env<'_>, sub: ResourceArc<SubscriptionResource>) -> Result<(), NifError> {
     ENV.set(&mut env.clone(), || {
         *sub.borrow_mut() = None;
         Ok(())
@@ -261,7 +258,7 @@ fn encode_state_as_update<'a>(
     })
 }
 #[rustler::nif]
-fn apply_update<'a>(env: Env<'a>, doc: NifDoc, update: Binary) -> Result<(), NifError> {
+fn apply_update(env: Env<'_>, doc: NifDoc, update: Binary) -> Result<(), NifError> {
     ENV.set(&mut env.clone(), || doc.apply_update(update.as_slice()))
 }
 
diff --git a/native/yex/src/map.rs b/native/yex/src/map.rs
index 0858846..48e9a76 100644
--- a/native/yex/src/map.rs
+++ b/native/yex/src/map.rs
@@ -20,7 +20,7 @@ pub struct NifMap {
 impl NifMap {
     pub fn new(doc: ResourceArc<DocResource>, map: MapRef) -> Self {
         NifMap {
-            doc: doc,
+            doc,
             reference: ResourceArc::new(map.into()),
         }
     }
@@ -36,8 +36,8 @@ impl NifMap {
     }
 
     pub fn set(&self, key: &str, input: NifYInput) -> Result<(), NifError> {
-        if let Some(mut txn) = self.doc.current_transaction.borrow_mut().as_mut() {
-            self.reference.insert(&mut txn, key, input);
+        if let Some(txn) = self.doc.current_transaction.borrow_mut().as_mut() {
+            self.reference.insert(txn, key, input);
             Ok(())
         } else {
             let mut txn = self.doc.0.doc.transact_mut();
diff --git a/native/yex/src/text.rs b/native/yex/src/text.rs
index 0377d07..f9316b2 100644
--- a/native/yex/src/text.rs
+++ b/native/yex/src/text.rs
@@ -16,18 +16,20 @@ pub struct NifText {
 impl NifText {
     pub fn new(doc: ResourceArc<DocResource>, text: TextRef) -> Self {
         NifText {
-            doc: doc,
+            doc,
             reference: ResourceArc::new(text.into()),
         }
     }
 
     pub fn insert(&self, index: u32, chunk: &str) -> Result<(), NifError> {
-        if let Some(mut txn) = self.doc.current_transaction.borrow_mut().as_mut() {
-            Ok(self.reference.insert(&mut txn, index, chunk))
+        if let Some(txn) = self.doc.current_transaction.borrow_mut().as_mut() {
+            self.reference.insert(txn, index, chunk);
+            Ok(())
         } else {
             let mut txn = self.doc.0.doc.transact_mut();
 
-            Ok(self.reference.insert(&mut txn, index, chunk))
+            self.reference.insert(&mut txn, index, chunk);
+            Ok(())
         }
     }
 
@@ -37,54 +39,61 @@ impl NifText {
         chunk: &str,
         attr: NifAttr,
     ) -> Result<(), NifError> {
-        if let Some(mut txn) = self.doc.current_transaction.borrow_mut().as_mut() {
-            Ok(self
-                .reference
-                .insert_with_attributes(&mut txn, index, chunk, attr.0))
+        if let Some(txn) = self.doc.current_transaction.borrow_mut().as_mut() {
+            self.reference
+                .insert_with_attributes(txn, index, chunk, attr.0);
+            Ok(())
         } else {
             let mut txn = self.doc.0.doc.transact_mut();
 
-            Ok(self
-                .reference
-                .insert_with_attributes(&mut txn, index, chunk, attr.0))
+            self.reference
+                .insert_with_attributes(&mut txn, index, chunk, attr.0);
+            Ok(())
         }
     }
 
     pub fn delete(&self, index: u32, len: u32) -> Result<(), NifError> {
-        if let Some(mut txn) = self.doc.current_transaction.borrow_mut().as_mut() {
-            Ok(self.reference.remove_range(&mut txn, index, len))
+        if let Some(txn) = self.doc.current_transaction.borrow_mut().as_mut() {
+            self.reference.remove_range(txn, index, len);
+            Ok(())
         } else {
             let mut txn = self.doc.0.doc.transact_mut();
 
-            Ok(self.reference.remove_range(&mut txn, index, len))
+            self.reference.remove_range(&mut txn, index, len);
+            Ok(())
         }
     }
 
     pub fn format(&self, index: u32, len: u32, attr: NifAttr) -> Result<(), NifError> {
-        if let Some(mut txn) = self.doc.current_transaction.borrow_mut().as_mut() {
-            Ok(self.reference.format(&mut txn, index, len, attr.0))
+        if let Some(txn) = self.doc.current_transaction.borrow_mut().as_mut() {
+            self.reference.format(txn, index, len, attr.0);
+            Ok(())
         } else {
             let mut txn = self.doc.0.doc.transact_mut();
-            Ok(self.reference.format(&mut txn, index, len, attr.0))
+            self.reference.format(&mut txn, index, len, attr.0);
+            Ok(())
         }
     }
 
-    pub fn to_string(&self) -> String {
+    pub fn length(&self) -> u32 {
         if let Some(txn) = self.doc.current_transaction.borrow_mut().as_mut() {
-            self.reference.get_string(txn)
+            self.reference.len(txn)
         } else {
             let txn = self.doc.0.doc.transact();
 
-            self.reference.get_string(&txn)
+            self.reference.len(&txn)
         }
     }
-    pub fn length(&self) -> u32 {
+}
+
+impl std::fmt::Display for NifText {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
         if let Some(txn) = self.doc.current_transaction.borrow_mut().as_mut() {
-            self.reference.len(txn)
+            write!(f, "{}", self.reference.get_string(txn))
         } else {
             let txn = self.doc.0.doc.transact();
 
-            self.reference.len(&txn)
+            write!(f, "{}", self.reference.get_string(&txn))
         }
     }
 }
diff --git a/native/yex/src/wrap.rs b/native/yex/src/wrap.rs
index 5910a31..d2deb98 100644
--- a/native/yex/src/wrap.rs
+++ b/native/yex/src/wrap.rs
@@ -9,7 +9,7 @@ unsafe impl<T> Sync for NifWrap<T> {}
 
 impl<T> From<T> for NifWrap<T> {
     fn from(w: T) -> NifWrap<T> {
-        return NifWrap::<T>(w);
+        NifWrap::<T>(w)
     }
 }
 
diff --git a/native/yex/src/youtput.rs b/native/yex/src/youtput.rs
index 4172367..d8a6819 100644
--- a/native/yex/src/youtput.rs
+++ b/native/yex/src/youtput.rs
@@ -26,11 +26,11 @@ impl NifValue {
             yrs::Value::YText(text) => NifValue::YText(NifText::new(doc, text)),
             yrs::Value::YArray(array) => NifValue::YArray(NifArray::new(doc, array)),
             yrs::Value::YMap(map) => NifValue::YMap(NifMap::new(doc, map)),
-            yrs::Value::YXmlElement(_) => NifValue::YXmlElement(NifXmlElement { doc: doc }),
+            yrs::Value::YXmlElement(_) => NifValue::YXmlElement(NifXmlElement { doc }),
             yrs::Value::YXmlFragment(_) => NifValue::YXmlFragment(NifXmlFragment {}),
-            yrs::Value::YXmlText(_) => NifValue::YXmlText(NifXmlText { doc: doc }),
+            yrs::Value::YXmlText(_) => NifValue::YXmlText(NifXmlText { doc }),
             yrs::Value::YDoc(doc) => NifValue::YDoc(NifDoc::from_native(doc)),
-            yrs::Value::UndefinedRef(_) => NifValue::UndefinedRef(NifUndefinedRef { doc: doc }),
+            yrs::Value::UndefinedRef(_) => NifValue::UndefinedRef(NifUndefinedRef { doc }),
         }
     }
 }
diff --git a/test/array_test.exs b/test/array_test.exs
index 6ac2913..83fcad2 100644
--- a/test/array_test.exs
+++ b/test/array_test.exs
@@ -1,7 +1,8 @@
 defmodule Yex.ArrayTest do
   use ExUnit.Case
   alias Yex.{Doc, Array, ArrayPrelim}
-  doctest Doc
+  doctest Array
+  doctest ArrayPrelim
 
   test "insert" do
     doc = Doc.new()
diff --git a/test/map_test.exs b/test/map_test.exs
index bcb1795..b70a9b2 100644
--- a/test/map_test.exs
+++ b/test/map_test.exs
@@ -1,7 +1,8 @@
 defmodule Yex.MapTest do
   use ExUnit.Case
   alias Yex.{Doc, Map, MapPrelim}
-  doctest Doc
+  doctest Map
+  doctest MapPrelim
 
   test "set" do
     doc = Doc.new()
diff --git a/test/text_test.exs b/test/text_test.exs
index deb6001..eb60200 100644
--- a/test/text_test.exs
+++ b/test/text_test.exs
@@ -1,7 +1,7 @@
 defmodule Yex.TextTest do
   use ExUnit.Case
   alias Yex.{Doc, Text}
-  doctest Doc
+  doctest Text
 
   test "transaction" do
     doc = Doc.new()