Throwaway measurement target for #18664. Bisection finished; this body is the record. Closed as completed.
What was measured
GitHub's refusal boundary for an issue body, in bytes, bracketed by writing bodies of chosen byte sizes through scripts/pm/post-stamped.mjs --body=18793 and reading each one back byte-exact. Exit 0 with read-back class identical = the platform stored every byte sent; exit 4 (EXIT_NOT_STORED) = the platform kept the OLD body and reported nothing.
Result: the largest body that stores is 262,144 bytes (256 KiB). 262,145 bytes is refused. The boundary is a single value, bracketed on both sides by writes from this run.
The bisection
| # |
size sent (bytes) |
chars |
exit |
class |
verdict |
| 1 |
257,945 |
257,945 |
0 |
identical |
landed |
| 2 |
263,533 |
263,533 |
4 |
not stored |
refused |
| 3 |
260,739 |
260,739 |
0 |
identical |
landed |
| 4 |
262,136 |
262,136 |
0 |
identical |
landed |
| 5 |
262,834 |
262,834 |
4 |
not stored |
refused |
| 6 |
262,485 |
262,485 |
4 |
not stored |
refused |
| 7 |
262,310 |
262,310 |
4 |
not stored |
refused |
| 8 |
262,223 |
262,223 |
4 |
not stored |
refused |
| 9 |
262,179 |
262,179 |
4 |
not stored |
refused |
| 10 |
262,157 |
262,157 |
4 |
not stored |
refused |
| 11 |
262,146 |
262,146 |
4 |
not stored |
refused |
| 12 |
262,141 |
262,141 |
0 |
identical |
landed |
| 13 |
262,143 |
262,143 |
0 |
identical |
landed |
| 14 |
262,144 |
262,144 |
0 |
identical |
landed |
| 15 |
262,145 |
262,145 |
4 |
not stored |
refused |
| 16 |
262,145 |
222,145 |
4 |
not stored |
refused (multi-byte) |
| 17 |
262,144 |
222,144 |
0 |
identical |
landed (multi-byte) |
Rows 1 and 2 re-took the two endpoints the filing card reported, as this run's own bracket. Rows 3 to 15 bisected it to one byte.
The unit question, answered by measurement
Rows 16 and 17 fill the body with a 20,000-character run of U+4E2D (3 UTF-8 bytes each) plus ASCII padding, so byte length and character length differ by 40,000.
- Row 16 sends 262,145 bytes but only 222,145 characters. A limit counted in characters (or in UTF-16 code units, which are the same number here) would have accepted it with 40,000 to spare. It was refused.
- Row 17 is the positive control: the same multi-byte shape at 262,144 bytes / 222,144 characters landed, so the refusal in row 16 is the one extra byte and not the multi-byte content.
The platform counts UTF-8 BYTES. 262,144 = 256 KiB exactly.
One incidental reading
Every landed write above read back as identical — no trailing-newline strip (these bodies carry no trailing newline) and no synthesised footer on an ISSUE BODY. That is the cell post-stamped's header calls unmeasured; it stays unmeasured for a body that DOES end in the footer block, which none of these did.
Generated by Claude Code
Throwaway measurement target for #18664. Bisection finished; this body is the record. Closed as
completed.What was measured
GitHub's refusal boundary for an issue body, in bytes, bracketed by writing bodies of chosen byte sizes through
scripts/pm/post-stamped.mjs --body=18793and reading each one back byte-exact. Exit 0 with read-back classidentical= the platform stored every byte sent; exit 4 (EXIT_NOT_STORED) = the platform kept the OLD body and reported nothing.Result: the largest body that stores is 262,144 bytes (256 KiB). 262,145 bytes is refused. The boundary is a single value, bracketed on both sides by writes from this run.
The bisection
Rows 1 and 2 re-took the two endpoints the filing card reported, as this run's own bracket. Rows 3 to 15 bisected it to one byte.
The unit question, answered by measurement
Rows 16 and 17 fill the body with a 20,000-character run of
U+4E2D(3 UTF-8 bytes each) plus ASCII padding, so byte length and character length differ by 40,000.The platform counts UTF-8 BYTES. 262,144 = 256 KiB exactly.
One incidental reading
Every landed write above read back as
identical— no trailing-newline strip (these bodies carry no trailing newline) and no synthesised footer on an ISSUE BODY. That is the cellpost-stamped's header calls unmeasured; it stays unmeasured for a body that DOES end in the footer block, which none of these did.Generated by Claude Code