[Full Changelog](https://github.com/matrix-org/matrix-js-sdk/compare/v9.7.0...v9.8.0-rc.1) * Optimise prefixed logger [\#1615](https://github.com/matrix-org/matrix-js-sdk/pull/1615) * Add debug logs to encryption prep, take 3 [\#1614](https://github.com/matrix-org/matrix-js-sdk/pull/1614) * Add functions for upper & lowercase random strings [\#1612](https://github.com/matrix-org/matrix-js-sdk/pull/1612) * Room helpers for invite permissions and join rules [\#1609](https://github.com/matrix-org/matrix-js-sdk/pull/1609) * Fixed wording in "Adding video track with id" log [\#1606](https://github.com/matrix-org/matrix-js-sdk/pull/1606) * Add more debug logs to encryption prep [\#1605](https://github.com/matrix-org/matrix-js-sdk/pull/1605) * Add option to set ice candidate pool size [\#1604](https://github.com/matrix-org/matrix-js-sdk/pull/1604) * Cancel call if no source was selected [\#1601](https://github.com/matrix-org/matrix-js-sdk/pull/1601)