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This takes #3014 and adds a commit implementing each spec change in the polyfill, following each of the spec commits.

Some test262 failures were revealed in the process, and the spec is changed accordingly, in separate commits so that it's easy to track what's different from #3014.

anba and others added 30 commits November 5, 2025 16:37
This spec change caused the following test failures:
FAIL: (intl) ZonedDateTime/p/since/argument-at-limits.js
FAIL: (intl) ZonedDateTime/p/until/argument-at-limits.js
The check in the "timeZone === 'UTC'" case in GetPossibleEpochNanoseconds
is necessary to make
ZonedDateTime/p/since/roundingincrement-addition-out-of-range.js
and
ZonedDateTime/p/until/roundingincrement-addition-out-of-range.js
pass. If it's changed to CheckISODaysRange(isoDateTime), that causes
other test failures.

Also changed and moved CheckISODaysRange(isoDateTime) test
in InterpretISODateTimeOffset; this was to fix the following failures:
FAIL: Duration/compare/relativeto-string-limits.js
FAIL: Duration/p/round/relativeto-string-limits.js
FAIL: Duration/p/total/relativeto-string-limits.js
FAIL: ZonedDateTime/compare/argument-string-limits.js
FAIL: ZonedDateTime/from/argument-string-limits.js
FAIL: ZonedDateTime/p/equals/argument-string-limits.js
FAIL: ZonedDateTime/p/since/argument-string-limits.js
FAIL: ZonedDateTime/p/until/argument-string-limits.js
@catamorphism catamorphism force-pushed the anba-balance-iso-date branch 2 times, most recently from ff0e8db to 21fedcc Compare November 13, 2025 02:50
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codecov bot commented Nov 13, 2025

Codecov Report

❌ Patch coverage is 97.31544% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.99%. Comparing base (53731c2) to head (b37b572).
⚠️ Report is 9 commits behind head on main.

Files with missing lines Patch % Lines
polyfill/lib/calendar.mjs 87.50% 2 Missing ⚠️
polyfill/lib/ecmascript.mjs 98.42% 1 Missing and 1 partial ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##             main    #3184      +/-   ##
==========================================
+ Coverage   96.96%   96.99%   +0.03%     
==========================================
  Files          22       22              
  Lines       10219    10196      -23     
  Branches     1841     1850       +9     
==========================================
- Hits         9909     9890      -19     
+ Misses        261      257       -4     
  Partials       49       49              

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@catamorphism
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Note: not every step passes tests on its own. The first step breaks these tests:

FAIL: Instant/compare/argument-string-limits.js
FAIL: Instant/from/argument-string-limits.js
FAIL: Instant/p/equals/argument-string-limits.js
FAIL: Instant/p/since/argument-string-limits.js
FAIL: Instant/p/until/argument-string-limits.js
FAIL: ZonedDateTime/from/argument-string-limits.js

which are fixed in a later step.

@catamorphism catamorphism marked this pull request as ready for review November 26, 2025 21:31
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2 participants