diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6ba222d..270e855 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -18,33 +18,106 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        job:
-          - { target: x86_64-unknown-linux-musl, os: linux, arch: amd64, runner: ubuntu-latest, cross: false }
-          - { target: x86_64-apple-darwin, os: darwin, arch: amd64, runner: macos-latest, cross: false }
-          - { target: x86_64-pc-windows-msvc, os: windows, arch: amd64, runner: windows-latest, cross: false }
-    runs-on: ${{ matrix.job.runner }}
+        target:
+          # BSDs
+          #- { platform: aarch64-unknown-freebsd, os: linux, runner: ubuntu-latest, run: true } # No rust core
+          - { platform: i686-unknown-freebsd, os: linux, runner: ubuntu-latest, run: false }
+          - { platform: x86_64-unknown-freebsd, os: linux, runner: ubuntu-latest, run: false }
+          #- { platform: aarch64-unknown-netbsd, os: linux, runner: ubuntu-latest, run: true } # No rust core
+          - { platform: x86_64-unknown-netbsd, os: linux, runner: ubuntu-latest, run: false }
+
+          # WASM
+          #- { platform: wasm32-wasi, os: linux, runner: ubuntu-latest, run: true } # Incompatible Tokio
+
+          # Android (redundant with Linux Musl)
+          - { platform: aarch64-linux-android, os: linux, runner: ubuntu-latest, run: true }
+          - { platform: arm-linux-androideabi, os: linux, runner: ubuntu-latest, run: true }
+          - { platform: i686-linux-android, os: linux, runner: ubuntu-latest, run: true }
+          - { platform: x86_64-linux-android, os: linux, runner: ubuntu-latest, run: true }
+
+          # Linux Musl
+          - { platform: aarch64-unknown-linux-musl, os: linux, runner: ubuntu-latest, run: true }
+          - { platform: arm-unknown-linux-musleabi, os: linux, runner: ubuntu-latest, run: true }
+          - { platform: i586-unknown-linux-musl, os: linux, runner: ubuntu-latest, run: true }
+          - { platform: i686-unknown-linux-musl, os: linux, runner: ubuntu-latest, run: true }
+          - { platform: x86_64-unknown-linux-musl, os: linux, runner: ubuntu-latest, run: true }
+
+          # Linux GNU
+          - { platform: aarch64-unknown-linux-gnu, os: linux, runner: ubuntu-latest, run: true }
+          - { platform: arm-unknown-linux-gnueabi, os: linux, runner: ubuntu-latest, run: true }
+          - { platform: i586-unknown-linux-gnu, os: linux, runner: ubuntu-latest, run: true }
+          - { platform: i686-unknown-linux-gnu, os: linux, runner: ubuntu-latest, run: true }
+          - { platform: x86_64-unknown-linux-gnu, os: linux, runner: ubuntu-latest, run: true }
+
+          #- { platform: mips-unknown-linux-gnu, os: linux, runner: ubuntu-latest, run: true } # No rust core
+          #- { platform: mips64-unknown-linux-gnuabi64, os: linux, runner: ubuntu-latest, run: true } # No rust core
+          - { platform: powerpc-unknown-linux-gnu, os: linux, runner: ubuntu-latest, run: true }
+          - { platform: powerpc64-unknown-linux-gnu, os: linux, runner: ubuntu-latest, run: true }
+          #- { platform: riscv32gc-unknown-linux-gnu, os: linux, runner: ubuntu-latest, run: true } # No rust core
+          - { platform: riscv64gc-unknown-linux-gnu, os: linux, runner: ubuntu-latest, run: true }
+          - { platform: s390x-unknown-linux-gnu, os: linux, runner: ubuntu-latest, run: true }
+          #- { platform: sparc-unknown-linux-gnu, os: linux, runner: ubuntu-latest, run: true } # No rust core
+          - { platform: sparc64-unknown-linux-gnu, os: linux, runner: ubuntu-latest, run: true }
+
+          # MacOS
+          - { platform: aarch64-apple-darwin, os: darwin, runner: macos-latest, run: false }
+          - { platform: x86_64-apple-darwin, os: darwin, runner: macos-latest, run: true }
+
+          # Windows
+          - { platform: aarch64-pc-windows-msvc, os: windows, runner: windows-latest, run: false }
+          - { platform: i586-pc-windows-msvc, os: windows, runner: windows-latest, run: false }
+          - { platform: i686-pc-windows-msvc, os: windows, runner: windows-latest, run: true }
+          - { platform: x86_64-pc-windows-msvc, os: windows, runner: windows-latest, run: true }
+        toolchain:
+          - stable
+          - nightly
+    runs-on: ${{ matrix.target.runner }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+      - uses: taiki-e/install-action@v2
+        with:
+          tool: protoc,sccache
       - name: Install toolchain
+        if: ${{ !contains(matrix.toolchain, 'nightly') }}
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.target.platform }}
+          toolchain: ${{ matrix.toolchain }}
+          components: rust-src,rust-docs,rustfmt,clippy
+      - name: Install toolchain (with miri)
+        if: contains(matrix.toolchain, 'nightly')
         uses: dtolnay/rust-toolchain@stable
         with:
-          targets: ${{ matrix.job.target }}
-          toolchain: 1.76.0
-          components: rust-src,rustfmt,clippy
+          targets: ${{ matrix.target.platform }}
+          toolchain: ${{ matrix.toolchain }}
+          components: rust-src,rust-docs,rustfmt,clippy,miri
+      - name: Install cross-compilation tools
+        uses: taiki-e/setup-cross-toolchain-action@v1
+        with:
+          target: ${{ matrix.target.platform }}
       - name: Setup Cache
         uses: Swatinem/rust-cache@v2.7.3
         with:
-          shared-key: "build-${{ matrix.job.target }}"
+          shared-key: "build-${{ matrix.toolchain }}-${{ matrix.target.platform }}"
       - name: Build
         run: |
-          cargo build --locked --release --target ${{ matrix.job.target }}
+          cargo build --all --locked
       - name: Test
+        if: matrix.target.run
+        run: |
+          cargo test --all --locked
+      - name: Test Release
+        if: matrix.target.run
+        run: |
+          cargo test --all --locked --release
+      - name: Test Miri
+        if: contains(matrix.toolchain, 'nightly')
         run: |
-          cargo test --locked --release --target ${{ matrix.job.target }}
+          cargo miri test --all --locked
       - name: Format
         run: |
-          cargo fmt --check
+          cargo fmt --all --check
       - name: Clippy
         run: |
-          cargo clippy --no-deps -- -Dwarnings -Dunused_extern_crates
+          cargo clippy --all --no-deps -- -Dwarnings -Dunused-crate-dependencies
diff --git a/src/encoder.rs b/src/encoder.rs
index df85769..a6de464 100644
--- a/src/encoder.rs
+++ b/src/encoder.rs
@@ -53,9 +53,9 @@ macro_rules! serialize {
             type Ok = ();
             type Error = Error;
 
-            fn $serialize<T: ?Sized>(&mut self, $($key: &'static str,)? value: &T) -> Result<(), Self::Error>
+            fn $serialize<T>(&mut self, $($key: &'static str,)? value: &T) -> Result<(), Self::Error>
             where
-                T: serde::Serialize,
+                T: serde::Serialize + ?Sized,
             {
                 $(self.current_field = $key;)?
                 value.serialize(&mut **self)
@@ -125,9 +125,9 @@ impl<'a> ser::Serializer for &'a mut SftpEncoder {
         Ok(())
     }
 
-    fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error>
+    fn serialize_some<T>(self, value: &T) -> Result<Self::Ok, Self::Error>
     where
-        T: serde::Serialize,
+        T: serde::Serialize + ?Sized,
     {
         value.serialize(self)
     }
@@ -149,19 +149,19 @@ impl<'a> ser::Serializer for &'a mut SftpEncoder {
         self.serialize_u32(variant_index)
     }
 
-    fn serialize_newtype_struct<T: ?Sized>(
+    fn serialize_newtype_struct<T>(
         self,
         name: &'static str,
         value: &T,
     ) -> Result<Self::Ok, Self::Error>
     where
-        T: serde::Serialize,
+        T: serde::Serialize + ?Sized,
     {
         self.current_field = name;
         value.serialize(self)
     }
 
-    fn serialize_newtype_variant<T: ?Sized>(
+    fn serialize_newtype_variant<T>(
         self,
         _name: &'static str,
         variant_index: u32,
@@ -169,7 +169,7 @@ impl<'a> ser::Serializer for &'a mut SftpEncoder {
         value: &T,
     ) -> Result<Self::Ok, Self::Error>
     where
-        T: serde::Serialize,
+        T: serde::Serialize + ?Sized,
     {
         self.current_field = variant;
         self.serialize_u32(variant_index)?;
@@ -265,16 +265,16 @@ impl<'a> ser::SerializeMap for &'a mut SftpEncoder {
     type Ok = ();
     type Error = Error;
 
-    fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), Self::Error>
+    fn serialize_key<T>(&mut self, key: &T) -> Result<(), Self::Error>
     where
-        T: serde::Serialize,
+        T: serde::Serialize + ?Sized,
     {
         key.serialize(&mut **self)
     }
 
-    fn serialize_value<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error>
+    fn serialize_value<T>(&mut self, value: &T) -> Result<(), Self::Error>
     where
-        T: serde::Serialize,
+        T: serde::Serialize + ?Sized,
     {
         value.serialize(&mut **self)
     }