During July 2025, Caolan McNamara enhanced the unicode-org/icu repository by implementing const-correctness for generated common data structures in C++. Focusing on low-level programming and data structure definition, he introduced const qualifiers in the pkg_gencmn.cpp code-generation workflow to enforce immutability after initialization. This approach improved data integrity by preventing accidental modification of shared ICU data, aligning with repository standards and supporting safer downstream usage. The work demonstrated a solid understanding of C++ const semantics and code generation, resulting in more maintainable and reliable data paths. No bugs were fixed during this period, reflecting a targeted feature-driven contribution.