June 2026 monthly summary for dora-rs/dora. Focused on strengthening correctness, reliability, and ROS2 compatibility in core data paths, with targeted fixes and testing improvements that deliver business value and reduce risk in production deployments. Key features delivered: - ROS2 Name Validation Enhancement for Hidden Topics: allow tokens that start with underscore in ROS2 names; only reject tokens that start with a digit; updates tests to reflect the change. Impact: reduces false positives for hidden topics and aligns with ROS2 runtime validation behavior. - NaiveDateTime Out-of-Range Handling with Saturation and Warning: saturates out-of-range NaiveDateTime values to i64::MIN/ MAX and emits a warning; adds tests validating new behavior. Impact: prevents silent data corruption and improves observability via logs. - Send_output Type Inference Correction and Type Registry Expansion: fixes argument index for the data array in send_output inference and expands the type registry (Int8, Int16, UInt16) with Arrow type mappings. Impact: improves runtime correctness and expands data-type support. Major bugs fixed: - Replaced silent epoch fallback for out-of-range NaiveDateTime with explicit saturation and warning, eliminating potential silent data loss. - Corrected send_output data array index handling in inference to prevent misinterpretation of outputs; updated runtime type validation to reflect new types. Overall impact and accomplishments: - Improved correctness, safety, and observability in core data-handling paths; enhanced reliability for ROS2-named topics and time-related data. - Strengthened test coverage and logging, enabling faster detection of regressions and clearer post-deployment diagnostics. Technologies/skills demonstrated: - Rust, test-driven development, tracing/logging (warns), and error handling. - Type system and runtime registry enhancements (Int8/Int16/UInt16) and Arrow data type mappings. - ROS2 naming conventions and validation logic alignment with runtime behavior.