fix(protocol): Correctly deserialize large unsigned values (#4472)

Fixes: #4469

CHANGELOG.md

@@ -8,6 +8,10 @@
 - Add flags context to event schema. ([#4458](https://github.com/getsentry/relay/pull/4458))
 - Add support for view hierarchy attachment scrubbing. ([#4452](https://github.com/getsentry/relay/pull/4452))
 
+**Bug Fixes**:
+
+- Fix a bug where parsing large unsigned integers would fail incorrectly. ([#4472](https://github.com/getsentry/relay/pull/4472))
+
 **Internal**:
 
 - Add data categories for LogItem and LogByte. ([#4455](https://github.com/getsentry/relay/pull/4455))

relay-protocol/src/value.rs

@@ -265,12 +265,10 @@ impl<'de> Deserialize<'de> for Value {
 
             #[inline]
             fn visit_u64<E>(self, value: u64) -> Result<Value, E> {
-                let signed_value = value as i64;
-                if signed_value as u64 == value {
-                    Ok(Value::I64(signed_value))
-                } else {
-                    Ok(Value::U64(value))
-                }
+                Ok(value
+                    .try_into()
+                    .map(Value::I64)
+                    .unwrap_or(Value::U64(value)))
             }
 
             #[inline]
@@ -504,3 +502,17 @@ impl PartialEq for Val<'_> {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_unsigned_signed() {
+        let v: Value = serde_json::from_str("9223372036854775816").unwrap();
+        assert_eq!(v, Value::U64(9223372036854775816));
+
+        let v: Value = serde_json::from_str("123").unwrap();
+        assert_eq!(v, Value::I64(123));
+    }
+}