Draft of Change record incremental mutation support

[sethfowler-datadog]

Changes

(This is a preview branch to make it easier to test PRs related to incremental mutation support for Change records. It's not intended to be merged directly; it's just here to help reviewers.)

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	171.96 KiB	172.02 KiB	+66 B	+0.04%	✅
Rum Profiler	4.67 KiB	4.67 KiB	0 B	0.00%	✅
Rum Recorder	24.88 KiB	27.33 KiB	+2.44 KiB	+9.82%	✅
Logs	56.29 KiB	56.36 KiB	+66 B	+0.11%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	127.73 KiB	127.80 KiB	+66 B	+0.05%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Pending...

🧠 Memory Performance

Pending...

🔗 RealWorld

[datadog-official]

⚠️ Tests

✨ Fix all issues with BitsAI or with Cursor

⚠️ Warnings

🧪 1 Test failed

segmentTelemetry with change records, should collect segment telemetry for all full snapshots from Chrome Headless 139.0.0.0 (Linux 0.0.0) (Datadog) (Fix with Cursor)

Error: Expected $[0].metrics.encoding.incrementalSnapshot = 'v1' to equal 'change'.
    at <Jasmine>
    at UserContext.<anonymous> (/go/src/github.com/DataDog/browser-sdk/packages/rum/src/domain/segmentCollection/startSegmentTelemetry.spec.ts:64:45 <- /tmp/_karma_webpack_36674/commons.js:381598:53)

ℹ️ Info

❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 80.74%
• Overall Coverage: 77.41% (+0.22%)

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