diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 99d9db7..3f33039 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,7 +22,7 @@ jobs:
       - name: Set up Rust toolchain
         id: setup-rust
         run: |
-          rustup toolchain install ${{ env.MSRV }} -c rustfmt,clippy -p minimal
+          rustup toolchain install ${{ env.MSRV }} -c rustfmt,clippy --profile minimal
 
       - name: caching
         uses: Swatinem/rust-cache@v2
@@ -39,4 +39,4 @@ jobs:
 
       - name: doc
         run: |
-          cargo +${{ env.MSRV }} doc --all-features
+          cargo +${{ env.MSRV }} doc --all-features --no-deps
diff --git a/bors.toml b/bors.toml
deleted file mode 100644
index fc646ce..0000000
--- a/bors.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-status = [
-  "continuous-integration/appveyor/branch"
-]
-
-timeout_sec = 18000 # 5 hours
diff --git a/src/com.rs b/src/com.rs
index 8b0025a..10edee7 100644
--- a/src/com.rs
+++ b/src/com.rs
@@ -11,44 +11,90 @@ use winapi::{ctypes::c_void, um::unknwnbase::IUnknown, Interface};
 pub struct ComPtr<T: Interface>(*mut T);
 
 impl<T: Interface> ComPtr<T> {
+    /// Creates a null ComPtr.
     pub fn null() -> Self {
         ComPtr(ptr::null_mut())
     }
 
+    /// Create a ComPtr from a raw pointer. This will call AddRef on the pointer.
+    ///
+    /// # Safety
+    ///
+    /// - if `raw` is not null, it must be a valid pointer to a COM object that implements T.
     pub unsafe fn from_raw(raw: *mut T) -> Self {
         if !raw.is_null() {
-            (&*(raw as *mut IUnknown)).AddRef();
+            (*(raw as *mut IUnknown)).AddRef();
         }
         ComPtr(raw)
     }
 
+    /// Returns true if the inner pointer is null.
     pub fn is_null(&self) -> bool {
         self.0.is_null()
     }
 
+    /// Returns the raw inner pointer. May be null.
     pub fn as_ptr(&self) -> *const T {
         self.0
     }
 
+    /// Returns the raw inner pointer as mutable. May be null.
     pub fn as_mut_ptr(&self) -> *mut T {
         self.0
     }
 
-    pub fn mut_void(&mut self) -> *mut *mut c_void {
-        &mut self.0 as *mut *mut _ as *mut *mut _
+    /// Returns a mutable reference to the inner pointer casted as a pointer to c_void.
+    ///
+    /// This is useful when D3D functions initialize objects by filling in a pointer to pointer
+    /// by taking `void**` as an argument.
+    ///
+    /// # Safety
+    ///
+    /// - Any modifications done to this pointer must result in the pointer either:
+    ///   - being set to null
+    ///   - being set to a valid pointer to a COM object that implements T
+    pub unsafe fn mut_void(&mut self) -> &mut *mut c_void {
+        // SAFETY: We must first get a reference pointing to our internal pointer
+        // and only then cast it. As if we cast it, then take a reference, we would
+        // end up with a reference to a temporary.
+        let refer: &mut *mut T = &mut self.0;
+        let void: *mut *mut c_void = refer.cast();
+
+        // SAFETY: This reference is valid for the duration of the borrow due our mutable borrow of self.
+        &mut *void
     }
 
-    pub fn mut_self(&mut self) -> *mut *mut T {
-        &mut self.0 as *mut *mut _
+    /// Returns a mutable reference to the inner pointer.
+    ///
+    /// This is useful when D3D functions initialize objects by filling in a pointer to pointer
+    /// by taking `T**` as an argument.
+    ///
+    /// # Safety
+    ///
+    /// - Any modifications done to this pointer must result in the pointer either:
+    ///   - being set to null
+    ///   - being set to a valid pointer to a COM object that implements T
+    pub fn mut_self(&mut self) -> &mut *mut T {
+        &mut self.0
     }
 }
 
 impl<T: Interface> ComPtr<T> {
+    /// Returns a reference to the inner pointer casted as a pointer IUnknown.
+    ///
+    /// # Safety
+    ///
+    /// - This pointer must not be null.
     pub unsafe fn as_unknown(&self) -> &IUnknown {
         debug_assert!(!self.is_null());
         &*(self.0 as *mut IUnknown)
     }
 
+    /// Casts the T to U using QueryInterface.
+    ///
+    /// # Safety
+    ///
+    /// - This pointer must not be null.
     pub unsafe fn cast<U>(&self) -> D3DResult<ComPtr<U>>
     where
         U: Interface,
@@ -86,7 +132,7 @@ impl<T: Interface> Drop for ComPtr<T> {
 impl<T: Interface> Deref for ComPtr<T> {
     type Target = T;
     fn deref(&self) -> &T {
-        debug_assert!(!self.is_null());
+        assert!(!self.is_null());
         unsafe { &*self.0 }
     }
 }
@@ -126,8 +172,8 @@ impl<T: Interface> Hash for ComPtr<T> {
 ///
 /// ```rust
 /// # pub use d3d12::weak_com_inheritance_chain;
-/// # mod actual { 
-/// #     pub struct ComObject; impl winapi::Interface for ComObject { fn uuidof() -> winapi::shared::guiddef::GUID { todo!() } } 
+/// # mod actual {
+/// #     pub struct ComObject; impl winapi::Interface for ComObject { fn uuidof() -> winapi::shared::guiddef::GUID { todo!() } }
 /// #     pub struct ComObject1; impl winapi::Interface for ComObject1 { fn uuidof() -> winapi::shared::guiddef::GUID { todo!() } }
 /// #     pub struct ComObject2; impl winapi::Interface for ComObject2 { fn uuidof() -> winapi::shared::guiddef::GUID { todo!() } }
 /// # }
@@ -223,12 +269,16 @@ macro_rules! weak_com_inheritance_chain {
         $variant:ident($type:ty);
         $($next_variant:ident),*;
     ) => {
-        // Construct this enum from weak pointer to this interface. For best usability, always use the highest constructor you can. This doesn't try to upcast.
+        #[doc = concat!("Constructs this enum from a ComPtr to ", stringify!($variant), ". For best usability, always use the highest constructor you can. This doesn't try to upcast.")]
+        ///
+        /// # Safety
+        ///
+        #[doc = concat!(" - The value must be a valid pointer to a COM object that implements ", stringify!($variant))]
         $vis unsafe fn $from_name(value: $crate::ComPtr<$type>) -> Self {
             Self::$variant(value)
         }
 
-        // Returns Some if the value implements the interface otherwise returns None.
+        #[doc = concat!("Returns Some if the value implements ", stringify!($variant), ".")]
         $vis fn $as_name(&self) -> Option<&$crate::ComPtr<$type>> {
             match *self {
                 $(
@@ -237,14 +287,14 @@ macro_rules! weak_com_inheritance_chain {
                 Self::$variant(ref v) => Some(v),
                 $(
                     Self::$next_variant(ref v) => {
-                        // v is &ComPtr<NextType> and se cast to &ComPtr<Type>
+                        // v is &ComPtr<NextType> and we cast to &ComPtr<Type>
                         Some(unsafe { std::mem::transmute(v) })
                     }
                 )*
             }
         }
 
-        // Returns the interface if the value implements it, otherwise panics.
+        #[doc = concat!("Returns a ", stringify!($variant), " if the value implements it, otherwise panics.")]
         #[track_caller]
         $vis fn $unwrap_name(&self) -> &$crate::ComPtr<$type> {
             match *self {
diff --git a/src/command_list.rs b/src/command_list.rs
index 015d578..168d935 100644
--- a/src/command_list.rs
+++ b/src/command_list.rs
@@ -19,7 +19,7 @@ pub enum CmdListType {
     // VideoProcess = d3d12::D3D12_COMMAND_LIST_TYPE_VIDEO_PROCESS,
 }
 
-bitflags! {
+bitflags::bitflags! {
     #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
     pub struct ClearFlags: u32 {
         const DEPTH = d3d12::D3D12_CLEAR_FLAG_DEPTH;
@@ -263,7 +263,7 @@ impl GraphicsCommandList {
         }
     }
 
-    pub fn set_pipeline_state(&self, pso:&PipelineState) {
+    pub fn set_pipeline_state(&self, pso: &PipelineState) {
         unsafe {
             self.SetPipelineState(pso.as_mut_ptr());
         }
diff --git a/src/descriptor.rs b/src/descriptor.rs
index 5bb1b5b..e0b4e6a 100644
--- a/src/descriptor.rs
+++ b/src/descriptor.rs
@@ -20,7 +20,7 @@ pub enum DescriptorHeapType {
     Dsv = d3d12::D3D12_DESCRIPTOR_HEAP_TYPE_DSV,
 }
 
-bitflags! {
+bitflags::bitflags! {
     #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
     pub struct DescriptorHeapFlags: u32 {
         const SHADER_VISIBLE = d3d12::D3D12_DESCRIPTOR_HEAP_FLAG_SHADER_VISIBLE;
@@ -253,7 +253,7 @@ pub enum RootSignatureVersion {
     V1_1 = d3d12::D3D_ROOT_SIGNATURE_VERSION_1_1,
 }
 
-bitflags! {
+bitflags::bitflags! {
     #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
     pub struct RootSignatureFlags: u32 {
         const ALLOW_IA_INPUT_LAYOUT = d3d12::D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT;
@@ -297,12 +297,7 @@ impl crate::D3D12Lib {
         let mut error = Error::null();
         let hr = unsafe {
             let func: libloading::Symbol<Fun> = self.lib.get(b"D3D12SerializeRootSignature")?;
-            func(
-                &desc,
-                version as _,
-                blob.mut_void() as *mut *mut _,
-                error.mut_void() as *mut *mut _,
-            )
+            func(&desc, version as _, blob.mut_self(), error.mut_self())
         };
 
         Ok(((blob, error), hr))
@@ -332,8 +327,8 @@ impl RootSignature {
             d3d12::D3D12SerializeRootSignature(
                 &desc,
                 version as _,
-                blob.mut_void() as *mut *mut _,
-                error.mut_void() as *mut *mut _,
+                blob.mut_self(),
+                error.mut_self(),
             )
         };
 
diff --git a/src/device.rs b/src/device.rs
index 517b858..475fa22 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -16,7 +16,7 @@ pub type Device = ComPtr<d3d12::ID3D12Device>;
 
 #[cfg(feature = "libloading")]
 impl crate::D3D12Lib {
-pub fn create_device<I: Interface>(
+    pub fn create_device<I: Interface>(
         &self,
         adapter: &ComPtr<I>,
         feature_level: crate::FeatureLevel,
diff --git a/src/dxgi.rs b/src/dxgi.rs
index 81e2aaa..7a67299 100644
--- a/src/dxgi.rs
+++ b/src/dxgi.rs
@@ -9,7 +9,7 @@ use winapi::{
     Interface,
 };
 
-bitflags! {
+bitflags::bitflags! {
     #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
     pub struct FactoryCreationFlags: u32 {
         const DEBUG = dxgi1_3::DXGI_CREATE_FACTORY_DEBUG;
@@ -211,7 +211,10 @@ impl SwapchainDesc {
 }
 
 impl Factory1 {
-    pub fn create_swapchain(
+    /// # Safety
+    ///
+    /// - `queue` must be a valid pointer to a D3D device.
+    pub unsafe fn create_swapchain(
         &self,
         queue: *mut IUnknown,
         hwnd: HWND,
@@ -242,8 +245,7 @@ impl Factory1 {
         };
 
         let mut swapchain = SwapChain::null();
-        let hr =
-            unsafe { self.CreateSwapChain(queue, &mut desc, swapchain.mut_void() as *mut *mut _) };
+        let hr = unsafe { self.CreateSwapChain(queue, &mut desc, swapchain.mut_self()) };
 
         (swapchain, hr)
     }
@@ -251,7 +253,10 @@ impl Factory1 {
 
 impl Factory2 {
     // TODO: interface not complete
-    pub fn create_swapchain_for_hwnd(
+    /// # Safety
+    ///
+    /// - `queue` must be a valid pointer to a D3D device.
+    pub unsafe fn create_swapchain_for_hwnd(
         &self,
         queue: *mut IUnknown,
         hwnd: HWND,
@@ -265,14 +270,17 @@ impl Factory2 {
                 &desc.to_desc1(),
                 ptr::null(),
                 ptr::null_mut(),
-                swap_chain.mut_void() as *mut *mut _,
+                swap_chain.mut_self(),
             )
         };
 
         (swap_chain, hr)
     }
 
-    pub fn create_swapchain_for_composition(
+    /// # Safety
+    ///
+    /// - `queue` must be a valid pointer to a D3D device.
+    pub unsafe fn create_swapchain_for_composition(
         &self,
         queue: *mut IUnknown,
         desc: &SwapchainDesc,
@@ -283,7 +291,7 @@ impl Factory2 {
                 queue,
                 &desc.to_desc1(),
                 ptr::null_mut(),
-                swap_chain.mut_void() as *mut *mut _,
+                swap_chain.mut_self(),
             )
         };
 
@@ -308,14 +316,17 @@ impl Factory4 {
 
     pub fn enumerate_adapters(&self, id: u32) -> D3DResult<Adapter1> {
         let mut adapter = Adapter1::null();
-        let hr = unsafe { self.EnumAdapters1(id, adapter.mut_void() as *mut *mut _) };
+        let hr = unsafe { self.EnumAdapters1(id, adapter.mut_self()) };
 
         (adapter, hr)
     }
 }
 
 impl FactoryMedia {
-    pub fn create_swapchain_for_composition_surface_handle(
+    /// # Safety
+    ///
+    /// - `queue` must be a valid pointer to a D3D device.
+    pub unsafe fn create_swapchain_for_composition_surface_handle(
         &self,
         queue: *mut IUnknown,
         surface_handle: HANDLE,
@@ -328,7 +339,7 @@ impl FactoryMedia {
                 surface_handle,
                 &desc.to_desc1(),
                 ptr::null_mut(),
-                swap_chain.mut_void() as *mut *mut _,
+                swap_chain.mut_self(),
             )
         };
 
@@ -336,7 +347,7 @@ impl FactoryMedia {
     }
 }
 
-bitflags! {
+bitflags::bitflags! {
     #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
     pub struct SwapChainPresentFlags: u32 {
         const DXGI_PRESENT_DO_NOT_SEQUENCE = dxgi::DXGI_PRESENT_DO_NOT_SEQUENCE;
diff --git a/src/heap.rs b/src/heap.rs
index 8d081a2..074de56 100644
--- a/src/heap.rs
+++ b/src/heap.rs
@@ -29,7 +29,7 @@ pub enum MemoryPool {
     L1 = d3d12::D3D12_MEMORY_POOL_L1,
 }
 
-bitflags! {
+bitflags::bitflags! {
     #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
     pub struct HeapFlags: u32 {
         const NONE = d3d12::D3D12_HEAP_FLAG_NONE;
diff --git a/src/lib.rs b/src/lib.rs
index 8a68475..db0aecd 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,4 @@
-#[macro_use]
-extern crate bitflags;
+#![allow(clippy::too_many_arguments)]
 
 use std::{convert::TryFrom, ffi::CStr};
 use winapi::{
@@ -100,10 +99,12 @@ pub type Blob = ComPtr<d3dcommon::ID3DBlob>;
 
 pub type Error = ComPtr<d3dcommon::ID3DBlob>;
 impl Error {
-    pub unsafe fn as_c_str(&self) -> &CStr {
-        debug_assert!(!self.is_null());
-        let data = self.GetBufferPointer();
-        CStr::from_ptr(data as *const _ as *const _)
+    pub fn as_c_str(&self) -> &CStr {
+        assert!(!self.is_null());
+        unsafe {
+            let data = self.GetBufferPointer();
+            CStr::from_ptr(data as *const _ as *const _)
+        }
     }
 }
 
diff --git a/src/pso.rs b/src/pso.rs
index 2c19bd4..72cc8bf 100644
--- a/src/pso.rs
+++ b/src/pso.rs
@@ -1,17 +1,22 @@
 //! Pipeline state
 
 use crate::{com::ComPtr, Blob, D3DResult, Error};
-use std::{ffi::{self, c_void}, ops::Deref, ptr, marker::PhantomData};
+use std::{
+    ffi::{self, c_void},
+    marker::PhantomData,
+    ops::Deref,
+    ptr,
+};
 use winapi::um::{d3d12, d3dcompiler};
 
-bitflags! {
+bitflags::bitflags! {
     #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
     pub struct PipelineStateFlags: u32 {
         const TOOL_DEBUG = d3d12::D3D12_PIPELINE_STATE_FLAG_TOOL_DEBUG;
     }
 }
 
-bitflags! {
+bitflags::bitflags! {
     #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
     pub struct ShaderCompileFlags: u32 {
         const DEBUG = d3dcompiler::D3DCOMPILE_DEBUG;
@@ -28,25 +33,34 @@ bitflags! {
 pub struct Shader<'a>(d3d12::D3D12_SHADER_BYTECODE, PhantomData<&'a c_void>);
 impl<'a> Shader<'a> {
     pub fn null() -> Self {
-        Shader(d3d12::D3D12_SHADER_BYTECODE {
-            BytecodeLength: 0,
-            pShaderBytecode: ptr::null(),
-        }, PhantomData)
+        Shader(
+            d3d12::D3D12_SHADER_BYTECODE {
+                BytecodeLength: 0,
+                pShaderBytecode: ptr::null(),
+            },
+            PhantomData,
+        )
     }
 
     pub fn from_raw(data: &'a [u8]) -> Self {
-        Shader(d3d12::D3D12_SHADER_BYTECODE {
-            BytecodeLength: data.len() as _,
-            pShaderBytecode: data.as_ptr() as _,
-        }, PhantomData)
+        Shader(
+            d3d12::D3D12_SHADER_BYTECODE {
+                BytecodeLength: data.len() as _,
+                pShaderBytecode: data.as_ptr() as _,
+            },
+            PhantomData,
+        )
     }
 
     // `blob` may not be null.
     pub fn from_blob(blob: &'a Blob) -> Self {
-        Shader(d3d12::D3D12_SHADER_BYTECODE {
-            BytecodeLength: unsafe { blob.GetBufferSize() },
-            pShaderBytecode: unsafe { blob.GetBufferPointer() },
-        }, PhantomData)
+        Shader(
+            d3d12::D3D12_SHADER_BYTECODE {
+                BytecodeLength: unsafe { blob.GetBufferSize() },
+                pShaderBytecode: unsafe { blob.GetBufferPointer() },
+            },
+            PhantomData,
+        )
     }
 
     /// Compile a shader from raw HLSL.
@@ -72,8 +86,8 @@ impl<'a> Shader<'a> {
                 target.as_ptr() as *const _,
                 flags.bits(),
                 0,
-                shader.mut_void() as *mut *mut _,
-                error.mut_void() as *mut *mut _,
+                shader.mut_self(),
+                error.mut_self(),
             )
         };
 
@@ -92,18 +106,24 @@ impl<'a> Deref for Shader<'a> {
 pub struct CachedPSO<'a>(d3d12::D3D12_CACHED_PIPELINE_STATE, PhantomData<&'a c_void>);
 impl<'a> CachedPSO<'a> {
     pub fn null() -> Self {
-        CachedPSO(d3d12::D3D12_CACHED_PIPELINE_STATE {
-            CachedBlobSizeInBytes: 0,
-            pCachedBlob: ptr::null(),
-        }, PhantomData)
+        CachedPSO(
+            d3d12::D3D12_CACHED_PIPELINE_STATE {
+                CachedBlobSizeInBytes: 0,
+                pCachedBlob: ptr::null(),
+            },
+            PhantomData,
+        )
     }
 
     // `blob` may not be null.
     pub fn from_blob(blob: &'a Blob) -> Self {
-        CachedPSO(d3d12::D3D12_CACHED_PIPELINE_STATE {
-            CachedBlobSizeInBytes: unsafe { blob.GetBufferSize() },
-            pCachedBlob: unsafe { blob.GetBufferPointer() },
-        }, PhantomData)
+        CachedPSO(
+            d3d12::D3D12_CACHED_PIPELINE_STATE {
+                CachedBlobSizeInBytes: unsafe { blob.GetBufferSize() },
+                pCachedBlob: unsafe { blob.GetBufferPointer() },
+            },
+            PhantomData,
+        )
     }
 }
 
diff --git a/src/queue.rs b/src/queue.rs
index 944cb6f..a569344 100644
--- a/src/queue.rs
+++ b/src/queue.rs
@@ -8,7 +8,7 @@ pub enum Priority {
     GlobalRealtime = d3d12::D3D12_COMMAND_QUEUE_PRIORITY_GLOBAL_REALTIME,
 }
 
-bitflags! {
+bitflags::bitflags! {
     #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
     pub struct CommandQueueFlags: u32 {
         const DISABLE_GPU_TIMEOUT = d3d12::D3D12_COMMAND_QUEUE_FLAG_DISABLE_GPU_TIMEOUT;