Timestamp issue?

[alexsnaps]

I'm not sure whether I'm the one doing something here, but I find this slightly confusing:

let script = "ts == timestamp('2023-05-28T00:00:00+00:00')";
let program = Program::compile(script).unwrap();
let mut context = Context::default();
let ts: DateTime<FixedOffset> = DateTime::parse_from_rfc3339("2023-05-28T00:00:00+00:00").unwrap();
context.add_variable("ts", Value::Timestamp(ts)).unwrap();
assert_eq!(program.execute(&context), Ok(true.into()));

Interestingly, this yields comparing: Timestamp(2023-05-28T00:00:00+00:00) vs String("2023-05-28T00:00:00+00:00")
Where the lhs is the timestamp('2023-05-28T00:00:00+00:00', but for some reason ts ends up being a ... String? Am I missing something here?

[clarkmcc]

This was a regression introduced in #40 (extension of changes in #33)

It is because of this trait

cel-rust/interpreter/src/context.rs

Line 50 in 2cb75cb

V: TryIntoValue,

Which ultimately calls this function, converting the timestamp to a string

cel-rust/interpreter/src/ser.rs

Line 577 in 2cb75cb

Value::Timestamp(ref dt) => serializer.serialize_str(&dt.to_rfc3339()),

Still thinking about exactly how to solve this. In the meantime, you can use this to add a Value type directly and skip serialization.

context.add_variable_from_value("foo", Value::Timestamp(DateTime::default()))

[clarkmcc]

I need to think through the repercussions of #68 but it does resolve the issue (test added). Because of this addition, I don't think there will be any breaking changes. We were effectively doing that before, just with an unnecessary intermediate serialization step.