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-rw-r--r--serde_v8/ser.rs27
1 files changed, 25 insertions, 2 deletions
diff --git a/serde_v8/ser.rs b/serde_v8/ser.rs
index 0c6c52da0..31d3e3144 100644
--- a/serde_v8/ser.rs
+++ b/serde_v8/ser.rs
@@ -377,6 +377,9 @@ macro_rules! forward_to {
};
}
+const MAX_SAFE_INTEGER: i64 = (1 << 53) - 1;
+const MIN_SAFE_INTEGER: i64 = -MAX_SAFE_INTEGER;
+
impl<'a, 'b, 'c> ser::Serializer for Serializer<'a, 'b, 'c> {
type Ok = v8::Local<'a, v8::Value>;
type Error = Error;
@@ -399,8 +402,6 @@ impl<'a, 'b, 'c> ser::Serializer for Serializer<'a, 'b, 'c> {
serialize_u16(u16, serialize_u32, 'a);
serialize_f32(f32, serialize_f64, 'a);
- serialize_u64(u64, serialize_f64, 'a);
- serialize_i64(i64, serialize_f64, 'a);
}
fn serialize_i32(self, v: i32) -> JsResult<'a> {
@@ -411,6 +412,28 @@ impl<'a, 'b, 'c> ser::Serializer for Serializer<'a, 'b, 'c> {
Ok(v8::Integer::new_from_unsigned(&mut self.scope.borrow_mut(), v).into())
}
+ fn serialize_i64(self, v: i64) -> JsResult<'a> {
+ let s = &mut self.scope.borrow_mut();
+ // If i64 can fit in max safe integer bounds then serialize as v8::Number
+ // otherwise serialize as v8::BigInt
+ if (MIN_SAFE_INTEGER..=MAX_SAFE_INTEGER).contains(&v) {
+ Ok(v8::Number::new(s, v as _).into())
+ } else {
+ Ok(v8::BigInt::new_from_i64(s, v).into())
+ }
+ }
+
+ fn serialize_u64(self, v: u64) -> JsResult<'a> {
+ let s = &mut self.scope.borrow_mut();
+ // If u64 can fit in max safe integer bounds then serialize as v8::Number
+ // otherwise serialize as v8::BigInt
+ if v <= (MAX_SAFE_INTEGER as u64) {
+ Ok(v8::Number::new(s, v as _).into())
+ } else {
+ Ok(v8::BigInt::new_from_u64(s, v).into())
+ }
+ }
+
fn serialize_f64(self, v: f64) -> JsResult<'a> {
Ok(v8::Number::new(&mut self.scope.borrow_mut(), v).into())
}