Variation-selector smuggling (A01) and Sneaky Bits (A02) gave 0 findings
on 1.4.1 and stayed in the sanitized text. The denominator is now the
frozen Unicode 18.0 set (DICP | Cf | Co, 141 674 codepoints); each one is
stripped and flagged unless a known legitimate use exempts it on context:
one VS15/16 after an emoji base, one ideographic selector after a CJK
ideograph, ZWNJ/ZWJ beside Arabic-script or Indic letters, LRM/RLM/ALM
in a document with RTL text, an Arabic number sign before a digit. A run
is always a carrier; private use is caught in full (operator decisions
2026-10-28). One predicate serves sanitize, the output gate and the
lexicon's word-split row, whose regex stays byte-identical with commons.
A01 and A02 are green; the FP populations and the pinned OKF corpus are
identical before and after.
