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Jake WriterandClaude Opus 5.5
165e68f831
Several draws swallowed their failure and used something else, so an
identity could ship with values the rest of it was not drawn to match and
nobody would hear about it:
- from_preset(): a failed font or voice draw used the preset's recorded
list, or nothing, on any exception.
- generate_context_fingerprint(): a failed font, voice or WebGL draw was
`except Exception: pass`, leaving the browser's launch-time values.
- _load_font_groups() / _load_font_bases(): an unreadable file became {},
i.e. no font additions or no OS-version base.
- launch_options(): a failed font draw used every font in fonts.json, a
failed voice draw used no voices, and a preset GPU missing from
webgl_data.db was silently swapped for a drawn one (36 of the 397
bundled presets).
Each site now catches only the errors its data can raise (OSError and
ValueError for an unreadable or corrupt file, KeyError for a manifest with
no entry for the OS, sqlite3.Error for the WebGL database) and emits a
FallbackWarning. The text names what failed and what the identity uses
instead, then gives a block to paste into an issue (camoufox, browser, OS
and Python versions, the error, and the identity's user agent or GPU),
asking the user to report it on GitHub. It shares LeakWarning's
caller-frame attribution and its template lives in warnings.yml.
The broad excepts had also been hiding a broken fixture:
test_launch_environment's font and voice stubs did not accept `seed`, so
every draw there raised and was swallowed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>