drupflare/worker - v1.0.4
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    Variable POLYFILLED_PLATFORMConst

    POLYFILLED_PLATFORM: PlatformVersions = ...

    Extensions supplied by PHP code rather than by the build.

    A polyfill is not the extension, so a module requiring one gets unverifiable, never installable (see checkRequirements). An entry leaves only when a measurement shows the build supplies the extension, not when a parity run finds fewer divergences.