[3.x] Improve PHP 8.4+ support by avoiding implicitly nullable types #536
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This changeset improves PHP 8.4+ support by avoiding implicitly nullable types as discussed in reactphp/promise#260.
I'm planning to add native types to the public API and introduce PHPStan in follow-up PRs.
Once merged, we should apply similar changes to all our upcoming v3 components. On top of this, we should backport similar changes to the v1 branch.
Builds on top of #530, #529, #508, #410, reactphp/promise#260, reactphp/socket#317, reactphp/stream#179, reactphp/async#87 and reactphp/promise-timer#70