fix: Multi turn evaluation causes JSON serialization error#62

ViaDézo1er (viadezo1er) merged 8 commits intomainbraintrustdata/braintrust-sdk-python:mainfrom

cedric/json-serialization-error-multi-turn-evaluationbraintrustdata/braintrust-sdk-python:cedric/json-serialization-error-multi-turn-evaluationCopy head branch name to clipboard