diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 0798944..035244c 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -34,6 +34,10 @@ jobs:
       run: cargo +nightly-2022-02-16 bench --verbose --features=bench --no-run
     - name: Build examples
       run: cargo build --examples --verbose --features=serde
+    - name: Lint
+      run: cargo clippy --examples --features=serde -- -D warnings
+    - name: Check format
+      run: cargo fmt -- --check
 
   build-test-lint-windows:
     name: Windows - build, test and lint
@@ -65,14 +69,10 @@ jobs:
           override: true
           components: rustfmt, clippy
       - name: Build
-        run: |
-          cargo build --examples
+        run: cargo build --examples
       - name: Test
-        run: |
-          cargo test --examples
+        run: cargo test --examples --features=serde
       - name: Lint
-        run: |
-          cargo clippy --examples -- -D warnings
+        run: cargo clippy --examples --features=serde -- -D warnings
       - name: Check format
-        run: |
-          cargo fmt -- --check
+        run: cargo fmt -- --check
diff --git a/examples/playlist.rs b/examples/playlist.rs
index 99e009f..7b81d59 100644
--- a/examples/playlist.rs
+++ b/examples/playlist.rs
@@ -1,13 +1,20 @@
+#[cfg(feature = "serde")]
 use anyhow::Result;
+#[cfg(feature = "serde")]
 use bliss_audio::distance::{closest_to_first_song, dedup_playlist, euclidean_distance};
+#[cfg(feature = "serde")]
 use bliss_audio::{library::analyze_paths_streaming, Song};
+#[cfg(feature = "serde")]
 use clap::{App, Arg};
+#[cfg(feature = "serde")]
 use glob::glob;
-use mime_guess;
-use serde_json;
+#[cfg(feature = "serde")]
 use std::env;
+#[cfg(feature = "serde")]
 use std::fs;
+#[cfg(feature = "serde")]
 use std::io::BufReader;
+#[cfg(feature = "serde")]
 use std::path::{Path, PathBuf};
 
 /* Analyzes a folder recursively, and make a playlist out of the file
diff --git a/src/chroma.rs b/src/chroma.rs
index 75bf619..7ca6ce3 100644
--- a/src/chroma.rs
+++ b/src/chroma.rs
@@ -207,13 +207,13 @@ fn chroma_filter(
     wts *= &freq_bins;
 
     // np.roll(), np bro
-    let mut uninit: Vec<f64> = Vec::with_capacity((&wts).len());
+    let mut uninit: Vec<f64> = vec![0.; (&wts).len()];
     unsafe {
         uninit.set_len(wts.len());
     }
     let mut b = Array::from(uninit)
         .into_shape(wts.dim())
-        .map_err(|e| BlissError::AnalysisError(format!("in chroma: {}", e.to_string())))?;
+        .map_err(|e| BlissError::AnalysisError(format!("in chroma: {}", e)))?;
     b.slice_mut(s![-3.., ..]).assign(&wts.slice(s![..3, ..]));
     b.slice_mut(s![..-3, ..]).assign(&wts.slice(s![3.., ..]));
 
@@ -308,7 +308,7 @@ fn pitch_tuning(
     }
     let max_index = counts
         .argmax()
-        .map_err(|e| BlissError::AnalysisError(format!("in chroma: {}", e.to_string())))?;
+        .map_err(|e| BlissError::AnalysisError(format!("in chroma: {}", e)))?;
 
     // Return the bin with the most reoccuring frequency.
     Ok((-50. + (100. * resolution * max_index as f64)) / 100.)
@@ -332,7 +332,7 @@ fn estimate_tuning(
 
     let threshold: N64 = Array::from(filtered_mag.to_vec())
         .quantile_axis_mut(Axis(0), n64(0.5), &Midpoint)
-        .map_err(|e| BlissError::AnalysisError(format!("in chroma: {}", e.to_string())))?
+        .map_err(|e| BlissError::AnalysisError(format!("in chroma: {}", e)))?
         .into_scalar();
 
     let mut pitch = filtered_pitch
diff --git a/src/temporal.rs b/src/temporal.rs
index d054508..3c10866 100644
--- a/src/temporal.rs
+++ b/src/temporal.rs
@@ -48,10 +48,7 @@ impl BPMDesc {
                 sample_rate,
             )
             .map_err(|e| {
-                BlissError::AnalysisError(format!(
-                    "error while loading aubio tempo object: {}",
-                    e.to_string()
-                ))
+                BlissError::AnalysisError(format!("error while loading aubio tempo object: {}", e))
             })?,
             bpms: Vec::new(),
         })
@@ -59,10 +56,7 @@ impl BPMDesc {
 
     pub fn do_(&mut self, chunk: &[f32]) -> BlissResult<()> {
         let result = self.aubio_obj.do_result(chunk).map_err(|e| {
-            BlissError::AnalysisError(format!(
-                "aubio error while computing tempo {}",
-                e.to_string()
-            ))
+            BlissError::AnalysisError(format!("aubio error while computing tempo {}", e))
         })?;
 
         if result > 0. {
diff --git a/src/timbral.rs b/src/timbral.rs
index 2624207..a8ed6e2 100644
--- a/src/timbral.rs
+++ b/src/timbral.rs
@@ -126,21 +126,21 @@ impl SpectralDesc {
                 .map_err(|e| {
                     BlissError::AnalysisError(format!(
                         "error while loading aubio centroid object: {}",
-                        e.to_string()
+                        e
                     ))
                 })?,
             rolloff_aubio_desc: SpecDesc::new(SpecShape::Rolloff, SpectralDesc::WINDOW_SIZE)
                 .map_err(|e| {
                     BlissError::AnalysisError(format!(
                         "error while loading aubio rolloff object: {}",
-                        e.to_string()
+                        e
                     ))
                 })?,
             phase_vocoder: PVoc::new(SpectralDesc::WINDOW_SIZE, SpectralDesc::HOP_SIZE).map_err(
                 |e| {
                     BlissError::AnalysisError(format!(
                         "error while loading aubio pvoc object: {}",
-                        e.to_string()
+                        e
                     ))
                 },
             )?,
@@ -163,10 +163,7 @@ impl SpectralDesc {
         self.phase_vocoder
             .do_(chunk, fftgrain.as_mut_slice())
             .map_err(|e| {
-                BlissError::AnalysisError(format!(
-                    "error while processing aubio pv object: {}",
-                    e.to_string()
-                ))
+                BlissError::AnalysisError(format!("error while processing aubio pv object: {}", e))
             })?;
 
         let bin = self
@@ -175,7 +172,7 @@ impl SpectralDesc {
             .map_err(|e| {
                 BlissError::AnalysisError(format!(
                     "error while processing aubio centroid object: {}",
-                    e.to_string()
+                    e
                 ))
             })?;