0.8.5 testing perf with dtoa (this breaks some tests, but the JSON is

still valid)

Author: maciejhirsz

Cargo.toml

@@ -9,3 +9,4 @@ license = "MIT"
 
 [dependencies]
 itoa = "0.1"
+dtoa = "0.1"

src/codegen.rs

@@ -3,6 +3,7 @@ use std::num::FpCategory;
 use JsonValue;
 
 extern crate itoa;
+extern crate dtoa;
 
 const QU: u8 = b'"';
 const BS: u8 = b'\\';
@@ -92,12 +93,13 @@ pub trait Generator {
                 if num.fract() == 0.0 && num.abs() < 1e19 {
                     itoa::write(self.get_writer(), num as i64).unwrap();
                 } else {
-                    let abs = num.abs();
-                    if abs < 1e-15 || abs > 1e19 {
-                        write!(self.get_writer(), "{:e}", num).unwrap();
-                    } else {
-                        write!(self.get_writer(), "{}", num).unwrap();
-                    }
+                    dtoa::write(self.get_writer(), num).unwrap();
+                    // let abs = num.abs();
+                    // if abs < 1e-15 || abs > 1e19 {
+                    //     write!(self.get_writer(), "{:e}", num).unwrap();
+                    // } else {
+                    //     write!(self.get_writer(), "{}", num).unwrap();
+                    // }
                 }
             },
             FpCategory::Zero => {