During October 2024, Charly focused on improving font rendering reliability in the ghostty-org/ghostty repository by addressing a nuanced bug in the font codepoint mapping logic. Working in Zig, Charly reworked the CodepointMap.get traversal to ensure deterministic mapping, prioritizing the latest matching codepoint range and reducing misassignment of font codepoints. This targeted fix enhanced typography consistency across projects and lowered support overhead. Charly reinforced the solution with comprehensive unit tests, validating the corrected logic and preventing future regressions. The work demonstrated careful debugging, minimal-risk changes, and a test-driven approach, reflecting a thoughtful application of Zig programming and font rendering expertise.