Release v2.0.0 · realm/realm-swift

This release introduces support for the Realm Mobile Platform!
See https://realm.io/news/introducing-realm-mobile-platform/ for an overview
of these great new features.

By popular demand, RealmSwift.Error has been moved from the top-level
namespace into a Realm extension and is now Realm.Error, so that it no
longer conflicts with Swift.Error.
Files written by Realm 2.0 cannot be read by 1.x or earlier versions. Old
files can still be opened.

The .log, .log_a and .log_b files no longer exist and the state tracked in
them has been moved to the main Realm file. This reduces the number of open
files needed by Realm, improves performance of both opening and writing to
Realms, and eliminates a small window where committing write transactions
would prevent other processes from opening the file.

Fix an assertion failure when sorting by zero properties.
Fix a mid-commit crash in one process also crashing all other processes with
the same Realm open.
Properly initialize new nullable float and double properties added to
existing objects to null rather than 0.
Fix a stack overflow when objects with indexed string properties had very
long common prefixes.
Fix a race condition which could lead to crashes when using async queries or
collection notifications.
Fix a bug which could lead to incorrect state when an object which links to
itself is deleted from the Realm.

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