diff --git a/lib/src/sparql/json_results.rs b/lib/src/sparql/json_results.rs
index d95070c5..231041d1 100644
--- a/lib/src/sparql/json_results.rs
+++ b/lib/src/sparql/json_results.rs
@@ -6,7 +6,7 @@ use crate::Error;
 use crate::Result;
 use std::io::Write;
 
-pub fn write_json_results(results: QueryResult, mut sink: &mut impl Write) -> Result<()> {
+pub fn write_json_results(results: QueryResult, mut sink: impl Write) -> Result<()> {
     match results {
         QueryResult::Boolean(value) => {
             sink.write_all(b"{\"head\":{},\"boolean\":")?;
@@ -81,7 +81,7 @@ pub fn write_json_results(results: QueryResult, mut sink: &mut impl Write) -> Re
     Ok(())
 }
 
-fn write_escaped_json_string(s: &str, sink: &mut impl Write) -> Result<()> {
+fn write_escaped_json_string(s: &str, mut sink: impl Write) -> Result<()> {
     sink.write_all(b"\"")?;
     for c in s.chars() {
         match c {
diff --git a/lib/src/sparql/model.rs b/lib/src/sparql/model.rs
index efb35324..df4f2d00 100644
--- a/lib/src/sparql/model.rs
+++ b/lib/src/sparql/model.rs
@@ -51,7 +51,7 @@ impl QueryResult {
     /// assert_eq!(results, "{\"head\":{\"vars\":[\"s\"]},\"results\":{\"bindings\":[{\"s\":{\"type\":\"uri\",\"value\":\"http://example.com\"}}]}}".as_bytes());
     /// # oxigraph::Result::Ok(())
     /// ```
-    pub fn write(self, writer: &mut impl Write, syntax: QueryResultSyntax) -> Result<()> {
+    pub fn write(self, writer: impl Write, syntax: QueryResultSyntax) -> Result<()> {
         match syntax {
             QueryResultSyntax::Xml => write_xml_results(self, writer),
             QueryResultSyntax::Json => write_json_results(self, writer),
@@ -78,7 +78,7 @@ impl QueryResult {
     /// assert_eq!(results, graph);
     /// # oxigraph::Result::Ok(())
     /// ```
-    pub fn write_graph(self, write: &mut impl Write, syntax: GraphSyntax) -> Result<()> {
+    pub fn write_graph(self, write: impl Write, syntax: GraphSyntax) -> Result<()> {
         if let QueryResult::Graph(triples) = self {
             match syntax {
                 GraphSyntax::NTriples => {
diff --git a/lib/src/sparql/xml_results.rs b/lib/src/sparql/xml_results.rs
index 75c3b533..aee096f7 100644
--- a/lib/src/sparql/xml_results.rs
+++ b/lib/src/sparql/xml_results.rs
@@ -17,7 +17,7 @@ use std::io::Write;
 use std::iter::empty;
 use std::rc::Rc;
 
-pub fn write_xml_results(results: QueryResult, sink: &mut impl Write) -> Result<()> {
+pub fn write_xml_results(results: QueryResult, sink: impl Write) -> Result<()> {
     let mut writer = Writer::new(sink);
     match results {
         QueryResult::Boolean(value) => {
diff --git a/lib/src/store/memory.rs b/lib/src/store/memory.rs
index 6f671253..18ab8e42 100644
--- a/lib/src/store/memory.rs
+++ b/lib/src/store/memory.rs
@@ -359,7 +359,7 @@ impl MemoryStore {
     /// Errors related to a bad syntax in the loaded file use the `INVALID_DATA` error kind.
     pub fn dump_graph(
         &self,
-        writer: &mut impl Write,
+        writer: impl Write,
         syntax: GraphSyntax,
         from_graph_name: &GraphName,
     ) -> Result<(), io::Error> {
@@ -390,11 +390,7 @@ impl MemoryStore {
     ///
     /// Errors related to parameter validation like the base IRI use the `INVALID_INPUT` error kind.
     /// Errors related to a bad syntax in the loaded file use the `INVALID_DATA` error kind.
-    pub fn dump_dataset(
-        &self,
-        writer: &mut impl Write,
-        syntax: DatasetSyntax,
-    ) -> Result<(), io::Error> {
+    pub fn dump_dataset(&self, writer: impl Write, syntax: DatasetSyntax) -> Result<(), io::Error> {
         dump_dataset(
             self.quads_for_pattern(None, None, None, None).map(Ok),
             writer,
diff --git a/lib/src/store/mod.rs b/lib/src/store/mod.rs
index c1625217..949595e7 100644
--- a/lib/src/store/mod.rs
+++ b/lib/src/store/mod.rs
@@ -109,7 +109,7 @@ where
 
 fn dump_graph(
     triples: impl Iterator<Item = Result<Triple, io::Error>>,
-    writer: &mut impl Write,
+    writer: impl Write,
     syntax: GraphSyntax,
 ) -> Result<(), io::Error> {
     match syntax {
@@ -179,7 +179,7 @@ where
 
 fn dump_dataset(
     quads: impl Iterator<Item = Result<Quad, io::Error>>,
-    writer: &mut impl Write,
+    writer: impl Write,
     syntax: DatasetSyntax,
 ) -> Result<(), io::Error> {
     match syntax {
diff --git a/lib/src/store/rocksdb.rs b/lib/src/store/rocksdb.rs
index 2b09541b..c4206ff7 100644
--- a/lib/src/store/rocksdb.rs
+++ b/lib/src/store/rocksdb.rs
@@ -242,7 +242,7 @@ impl RocksDbStore {
     /// See `MemoryStore` for a usage example.
     pub fn dump_graph(
         &self,
-        writer: &mut impl Write,
+        writer: impl Write,
         syntax: GraphSyntax,
         from_graph_name: &GraphName,
     ) -> Result<(), io::Error> {
@@ -257,11 +257,7 @@ impl RocksDbStore {
     /// Dumps the store dataset into a file.
     ///    
     /// See `MemoryStore` for a usage example.
-    pub fn dump_dataset(
-        &self,
-        writer: &mut impl Write,
-        syntax: DatasetSyntax,
-    ) -> Result<(), io::Error> {
+    pub fn dump_dataset(&self, writer: impl Write, syntax: DatasetSyntax) -> Result<(), io::Error> {
         dump_dataset(
             self.quads_for_pattern(None, None, None, None),
             writer,
diff --git a/lib/src/store/sled.rs b/lib/src/store/sled.rs
index 8884538b..f560a489 100644
--- a/lib/src/store/sled.rs
+++ b/lib/src/store/sled.rs
@@ -226,7 +226,7 @@ impl SledStore {
     /// See `MemoryStore` for a usage example.
     pub fn dump_graph(
         &self,
-        writer: &mut impl Write,
+        writer: impl Write,
         syntax: GraphSyntax,
         from_graph_name: &GraphName,
     ) -> Result<(), io::Error> {
@@ -241,11 +241,7 @@ impl SledStore {
     /// Dumps the store dataset into a file.
     ///    
     /// See `MemoryStore` for a usage example.
-    pub fn dump_dataset(
-        &self,
-        writer: &mut impl Write,
-        syntax: DatasetSyntax,
-    ) -> Result<(), io::Error> {
+    pub fn dump_dataset(&self, writer: impl Write, syntax: DatasetSyntax) -> Result<(), io::Error> {
         dump_dataset(
             self.quads_for_pattern(None, None, None, None),
             writer,