Changelog

tc39/ecma262 · May 4–10, 2026 · 6 commits

Spec refactors streamline conversions and execution contexts

This week cleaned up shared spec machinery for integer coercions and suspended contexts, plus a few snapshot and JSON editorial fixes.

Shared spec machinery was factored out

The spec now has reusable helpers for common abstract-operation patterns. ToFixedSizeInteger centralizes the shared logic behind fixed-width integer conversions, and RunSuspendedContext captures the repeated suspend/push/resume flow used by generators and async machinery. These changes mostly improve consistency and readability, while clarifying -0 handling and reducing duplicated execution steps.

Snapshot warning UX improved

The snapshot warning overlay can now be dismissed with Escape, making it easier to get back to the spec and improving keyboard accessibility. Internal preview navigation also once again auto-collapses the warning when moving within the same snapshot, with more robust path-prefix matching.

Editorial cleanup in array and JSON algorithms

A small docs clarification landed for Array.prototype.reduce and reduceRight to better explain the first callback skip when initialValue is omitted. There was also a correction in SerializeJSONProperty removing an inaccurate assertion about arrays and proxies, plus a signature cleanup for SerializeJSONArray in the rendered text.

Other misc changes

  • No other notable changes this week.