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fix(#3497): unescape double-quoted scalars on parse so round-trips stop doubling backslashes (#3521)

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* fix(#3497): unescape double-quoted scalars on parse so round-trips stop doubling backslashes

* chore(#3497): add changeset fragment for PR #3521

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Co-authored-by: sim <sim@local>
This commit is contained in:
Tom Boucher
2026-08-14 23:00:10 -04:00
committed by GitHub
parent 6badb839a0
commit 507db38404
3 changed files with 168 additions and 2 deletions
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.changeset/3497-frontmatter-escape-amplification.md Normal file
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---
type: Fixed
pr: 3521
---
**Frontmatter round-trips no longer double backslashes on every state write** — `escapeDoubleQuoted` escaped `\`, `"`, and control characters on each serialize while the parser only stripped the outer quote delimiters, so every read-modify-write cycle doubled existing escapes (2ⁿ−1 backslashes after n cycles). `syncStateFrontmatter` carries `last_activity_desc` through that seam on every state command, growing STATE.md unboundedly — the reported 134 MB file OOMed `state.record-session` after 26 writes. Double-quoted scalars are now un-escaped on parse via the exact inverse of the escaper, making serialize→parse a fixed point; unrecognized escapes are kept literally so hand-authored files parse unchanged. (#3497)