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This strips \u{FEFF} from input before extraction to prevent silent data
corruption when user text contains placeholder-like sequences.
Placeholders use \u{FEFF}cjk...\u{FEFF} as delimiters; any \u{FEFF} in
user input (BOM, adversarial) would cause restore_preserved() to replace
user content with placeholder originals.
Since \u{FEFF} is an invisible zero-width character with no semantic
value in CJK prompt text, stripping is safe and eliminates the entire
collision class.
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #13 +/- ##
==========================================
+ Coverage 68.24% 68.48% +0.24%
==========================================
Files 11 11
Lines 762 768 +6
==========================================
+ Hits 520 526 +6
Misses 242 242
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This strips \u{FEFF} from input before extraction to prevent silent data corruption when user text contains placeholder-like sequences. Placeholders use \u{FEFF}cjk...\u{FEFF} as delimiters; any \u{FEFF} in user input (BOM, adversarial) would cause restore_preserved() to replace user content with placeholder originals.
Since \u{FEFF} is an invisible zero-width character with no semantic value in CJK prompt text, stripping is safe and eliminates the entire collision class.