* Emit an event when the client receives TURN servers ([\#2529](https://github.com/matrix-org/matrix-js-sdk/pull/2529)). * Add support for stable prefixes for MSC2285 ([\#2524](https://github.com/matrix-org/matrix-js-sdk/pull/2524)). * Always block sending keys to unverified devices of verified users ([\#2562](https://github.com/matrix-org/matrix-js-sdk/pull/2562)). Contributed by @duxovni. * Remove stream-replacement ([\#2551](https://github.com/matrix-org/matrix-js-sdk/pull/2551)). * Add support for sending user-defined encrypted to-device messages ([\#2528](https://github.com/matrix-org/matrix-js-sdk/pull/2528)). * Retry to-device messages ([\#2549](https://github.com/matrix-org/matrix-js-sdk/pull/2549)). Fixes vector-im/element-web#12851. * Sliding sync: add missing filters from latest MSC ([\#2555](https://github.com/matrix-org/matrix-js-sdk/pull/2555)). * Use stable prefixes for MSC3827 ([\#2537](https://github.com/matrix-org/matrix-js-sdk/pull/2537)). * Don't load the sync accumulator if there's already a sync persist in flight ([\#2569](https://github.com/matrix-org/matrix-js-sdk/pull/2569)).