Replace integer to_string with itoa

src/number.rs

@@ -702,7 +702,7 @@ impl From<ParserNumber> for Number {
                 }
                 #[cfg(feature = "arbitrary_precision")]
                 {
-                    u.to_string()
+                    itoa::Buffer::new().format(u).to_owned()
                 }
             }
             ParserNumber::I64(i) => {
@@ -712,7 +712,7 @@ impl From<ParserNumber> for Number {
                 }
                 #[cfg(feature = "arbitrary_precision")]
                 {
-                    i.to_string()
+                    itoa::Buffer::new().format(i).to_owned()
                 }
             }
             #[cfg(feature = "arbitrary_precision")]

src/value/ser.rs

@@ -490,43 +490,43 @@ impl serde::Serializer for MapKeySerializer {
     }
 
     fn serialize_i8(self, value: i8) -> Result<String> {
-        Ok(value.to_string())
+        Ok(itoa::Buffer::new().format(value).to_owned())
     }
 
     fn serialize_i16(self, value: i16) -> Result<String> {
-        Ok(value.to_string())
+        Ok(itoa::Buffer::new().format(value).to_owned())
     }
 
     fn serialize_i32(self, value: i32) -> Result<String> {
-        Ok(value.to_string())
+        Ok(itoa::Buffer::new().format(value).to_owned())
     }
 
     fn serialize_i64(self, value: i64) -> Result<String> {
-        Ok(value.to_string())
+        Ok(itoa::Buffer::new().format(value).to_owned())
     }
 
     fn serialize_i128(self, value: i128) -> Result<String> {
-        Ok(value.to_string())
+        Ok(itoa::Buffer::new().format(value).to_owned())
     }
 
     fn serialize_u8(self, value: u8) -> Result<String> {
-        Ok(value.to_string())
+        Ok(itoa::Buffer::new().format(value).to_owned())
     }
 
     fn serialize_u16(self, value: u16) -> Result<String> {
-        Ok(value.to_string())
+        Ok(itoa::Buffer::new().format(value).to_owned())
     }
 
     fn serialize_u32(self, value: u32) -> Result<String> {
-        Ok(value.to_string())
+        Ok(itoa::Buffer::new().format(value).to_owned())
     }
 
     fn serialize_u64(self, value: u64) -> Result<String> {
-        Ok(value.to_string())
+        Ok(itoa::Buffer::new().format(value).to_owned())
     }
 
     fn serialize_u128(self, value: u128) -> Result<String> {
-        Ok(value.to_string())
+        Ok(itoa::Buffer::new().format(value).to_owned())
     }
 
     fn serialize_f32(self, value: f32) -> Result<String> {