fix(flags): Enjoy the benefits of /decide?v=4

[haacked]

This reverts commit 502c4c0 which reverted 4c25512. We got ourselves a revert chain!

The purpose of this commit is to re-enable support for /decide?v=4. See this PR for more details: #1838

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Mar 21, 2025 5:54pm

[greptile-apps]

PR Summary

This PR re-enables support for /decide?v=4 endpoint across the PostHog JavaScript SDK, updating test files and adding IE11 compatibility.

• Added Object.fromEntries polyfill in src/entrypoints/array.full.es5.ts for IE11 support
• Updated test assertions in src/__tests__/posthog-core.loaded.test.ts to expect /decide/?v=4 endpoint
• Modified src/posthog-featureflags.ts to handle both legacy and v4 API formats
• Updated URL patterns in playwright/session-recording/session-recording-network-recorder.spec.ts for v4 endpoint testing
• Ensured backward compatibility while enabling access to newer feature flag functionality

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[dmarticus]

here's hoping we don't have to revert this again lmao.

Thanks for doing this :)

[github-actions]

Size Change: +22.6 kB (+0.63%)

Total Size: 3.63 MB

Filename	Size	Change
dist/array.full.es5.js	301 kB	+22.6 kB (+8.1%)	🔍

ℹ️ View Unchanged

Filename	Size
dist/all-external-dependencies.js	220 kB
dist/array.full.js	381 kB
dist/array.full.no-external.js	380 kB
dist/array.js	188 kB
dist/array.no-external.js	187 kB
dist/customizations.full.js	14.1 kB
dist/dead-clicks-autocapture.js	14.5 kB
dist/exception-autocapture.js	9.94 kB
dist/external-scripts-loader.js	2.75 kB
dist/main.js	189 kB
dist/module.full.js	381 kB
dist/module.full.no-external.js	380 kB
dist/module.js	189 kB
dist/module.no-external.js	187 kB
dist/posthog-recorder.js	211 kB
dist/recorder-v2.js	115 kB
dist/recorder.js	115 kB
dist/surveys-preview.js	71.3 kB
dist/surveys.js	76.6 kB
dist/tracing-headers.js	1.76 kB
dist/web-vitals.js	10.4 kB

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