v4.0.1

Bug Fixes

• Invisible Unicode bypass: Strip \p{Cf} format characters (zero-width spaces, invisible separators) from input before processing, so profanity like f⁣uck (with U+2063) is correctly detected
• Asterisk censoring bypass: Add * as a universal letter substitution so censored profanity like f*g, s**t, f**k is detected
• Internal masking: Use \x01 instead of * for internal masking during detection loop to prevent re-matching masked text
• Null safety: Guard against preg_replace returning null on malformed UTF-8 input