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v1.52.0

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@claude claude released this 24 Aug 01:16
· 973 commits to main since this release
v1.52.0
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What's new in v1.52.0

This release lands LVal hermetic sealing — a copy-on-write ownership model for interpreter values — along with the optimizations and verification tooling it enables.

Sealing & memory safety

  • Introduce hermetic sealing for LVal: zero-cost sealed stack, seal/copy-on-write semantics, and verification tooling (#517).
  • Seal Program trees at construction, closing the #394 leak (#523).
  • Raise a catchable condition on writes through sealed values instead of silently copying-on-write (#527).
  • Add sealing verification: an elpsvet escape-aliasing rule, a copy builtin with CoW census, and corruption fuzz targets (#518).

Performance

  • Seal-enabled optimizations and template-environment Fork (#519).
  • Share sealed builtin formals templates across environments (#525).
  • Remove per-definition throwaway allocations from registration and import (#526).

Internals & dependencies

  • Add an accessor API for LVal internals via mechanical migration ahead of sealing (#520).
  • Drop the go-runewidth dependency from diagnostic (#522).
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