Python 3.15 upgrade exposes latent encoding bug, not JIT speedup

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A development team upgraded a data pipeline to Python 3.15 in October 2026, anticipating performance gains from a new JIT compiler. After the upgrade, a nightly customer activity report began displaying garbled text for some names containing Cyrillic or accented characters. Investigation revealed the corruption was not due to database drivers or locale settings, but to a change in Python's default text encoding behavior. Python 3.15 now defaults to UTF-8 for file I/O in certain ambiguous cases, exposing a long-dormant bug where the team's code had never explicitly specified an encoding.

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