Merge `release/6.4.x` into `main` - #2226

Merged

jmschonfeld merged 17 commits into

mainfrom

automerge/merge-main-2026-09-05_09-07

Sep 6, 2026

Commits on Aug 27, 2026

Check lowercase 'addressbook' scheme only (#2139)

jrflat
authored and
itingliu
committed
149bd1c
(183444619) Update appending(component:) docs for file URL behavior (#2140)

jrflat
authored and
itingliu
committed
4021bb2
(182536658) URL/Components.host should not percent-decode %00 (#2141)

jrflat
authored and
itingliu
committed
5008028
Correct BOM detection for files with unknown encoding (#2126)

jmschonfeld
authored and
itingliu
committed
8292c53
AttributedString.Runs.AttributesSlice5 should include the 5th attribute when slicing (#2145)

jmschonfeld
authored and
itingliu
committed
abc7f7f
Additional Data.InlineData bounds checking (#2155)

jmschonfeld
authored and
itingliu
committed
4ede1e2
1-byte OOB read in JSON5Scanner.validateLeadingZero — hex-prefix guard off-by-one (#2158)

kperryua
authored and
itingliu
committed
2c827d6
Heap OOB read in JSONScanner strtof/strtod when assumesTopLevelDictionary and number is trailing (#2157)

kperryua
authored and
itingliu
committed
0fe177b
Update file permissions atomically during atomic writes (#2161)

kperryua
authored and
itingliu
committed
a1df314
BPlistScanner accepts object offsets < 8 (parser differential vs CFBinaryPlist) (#2156)

kperryua
authored and
itingliu
committed
9c2ad3f
Validate buffer counts are non-negative in Data APIs (#2162)

jmschonfeld
authored and
itingliu
committed
6804b60
Enforce lower bound check in inline Data.subscript(Range) (#2163)

jmschonfeld
authored and
itingliu
committed
9b3e458
Honor omitPaddingCharacter when base64 encoding with line breaks (#2150)

maxches99
authored and
itingliu
committed
6528266
fr_CA: 24-hour setting is incorrect (#2154)
itingliu
committed
6576049
Relax NotificationCenterMessage async test timeout (#2169)

cthielen
authored and
itingliu
committed
c91c870

Commits on Sep 4, 2026

Merge pull request #2212 from itingliu/cherry-pick-back-6.4.2
jmschonfeld
authored
90093f1

Commits on Sep 6, 2026

Merge branch 'main' into automerge/merge-main-2026-09-05_09-07
jmschonfeld
authored
3218bfe