Adopt when:
Look elsewhere or pause when:
For executives: Version 4.1.0 is a low-risk compatibility release that adds PHP 8 support. In practical terms it removes a dependency-level blocker to our PHP 8 upgrade, which is the main gating item for the runtime modernization work. There is no new functionality and no indication of breaking changes — it is a "keep the lights on and stay current" release.
For engineering: Treat 4.1.0 as the version to target for any PHP 8 environment. It is a minor version, so semver implies drop-in compatibility with 4.0.x; still, run the test suite and a dependency resolution check (composer why-not php 8.x) before rolling it across services, since transitive constraints are the usual failure point. Confirm whether 7.x remains supported within the 4.x line if you have services that cannot upgrade yet, and pin explicitly rather than floating if you need a stable target during the transition. Recommend adopting now and standardizing on 4.x fleet-wide.
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