New Issue: [Bug]: jsonSerializer used on custom serialized class can result in invalid json

Notifications Issues
1

28783, "jabraham17", "[Bug]: jsonSerializer used on custom serialized class can result in invalid json", "2026-05-06T23:47:10Z"

Summary of Problem

Description:
I found that with a custom serializer, the jsonSerializer can generate invalid json strings because it tries to escape strings too early

Is this issue currently blocking your progress?
no

Steps to Reproduce

Source Code:

use Map;

record myRec: writeSerializable {
  var x: int;
}
proc myRec.serialize(writer, ref serializer) throws {
  writer.write("x is \"", x, "\"");
}

var m: map(string, myRec);
m.add("first", new myRec(x=1));
m.add("second", new myRec(x=2));

use IO, JSON;
stdout.withSerializer(new jsonSerializer()).writeln(m);

Output

{
  "second": "x is \""2"\"", 
  "first": "x is \""1"\""
}

Expected output

{
  "second": "x is \"2\"", 
  "first": "x is \"1\""
}

if writer.write("x is \"", x, "\""); is written instead as writer.write("x is \"" + x:string + "\"");, everything works fine