January 2026: Delivered targeted deserialization hardening for facet-rs/facet, focusing on XML and HTML data ingestion and flattened nested maps. Key efforts include cross-module fixes and regression tests to ensure long-term stability across facet and facet-xml. Specific changes and impact: - Fixed XML deserialization conflicts where an XML element and attribute share the same name, across facet library and facet-xml module, with regression tests added. - Hardened HTML deserialization to correctly interpret elements and attributes (issue #1656), with regression tests. - Improved deserialization of nested flattened fields for nested maps to avoid errors in complex payloads, with fixes tracked in commit 23085e3e038422421cf53715a2c536e71be6fc64. - Tests expanded to prevent regressions and strengthen cross-module reliability between facet-rs/facet and facet-xml. Tech notes: Rust-based implementations, cross-module context-aware matching, and emphasis on test-driven development and regression coverage. Business value includes more reliable data ingestion, reduced debugging time, and improved downstream parsing stability for end users.

December 2025 — facet-rs/facet: Delivered robust XML namespace handling in deserialization to reduce ambiguity and errors in XML inputs. Implemented a namespace-attribute detection function and updated deserialization logic to ignore attributes reserved for XML namespace definitions and namespace-prefixed attributes. Added unit tests to validate behavior when deny_unknown_fields is enabled, ensuring conflict-free and future-proof parsing. This work improves data integrity, stability of XML ingestion, and developer confidence during schema changes.