boundary

I'm using the references from this page, https://docs.boundaryml.com/guide/baml-advanced/collector-track-tokens, to get the timing stats. However, when I try to get the duration (`print(collector.last.timing.duration_ms)`) the program crashes:

return typing.cast(types.Resume, result.cast_to(types, types, stream_types, False, __runtime__))
                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
baml_py.internal_monkeypatch.BamlValidationError: BamlValidationError(message=Failed to parse LLM response: Failed to coerce value: <root>: Failed while parsing required fields: missing=2, unparsed=0

Oh, I wonder if this is working as intended in the current design, since `last: FunctionLog | null`