realm/realm-swift v10.21.1 on GitHub

The sync client will now drain the receive queue when a send fails with ECONNRESET, ensuring that any error message from the server gets received and processed. (#5078)
Schema validation was missing for embedded objects in sets, resulting in an unhelpful error being thrown if a Realm object subclass contained one (since v10.0.0).
Opening a Realm with a schema that has an orphaned embedded object type performed an extra empty write transaction (since v10.0.0).
Freezing a Realm with a schema that has orphaned embedded object types threw a "Wrong transactional state" exception (since v10.19.0).
@sum and @avg queries on Dictionaries of floats or doubles used too much precision for intermediates, resulting in incorrect rounding (since v10.5.0).
Change the exception message for calling refresh on an immutable Realm from "Continuous transaction through DB object without history information." to "Can't refresh a read-only Realm." (#5061, since v10.8.0).
Queries of the form "link.collection.@sum = 0" where link is null matched when collection was a List or Set, but not a Dictionary
(#5080, since v10.8.0).
Types which require custom obj-c bridging (such as PersistableEnum or CustomPersistable) would crash with exceptions mentioning __SwiftValue in a variety of places on iOS versions older than iOS 14 (#7604, since v10.21.0)