# Important: .NET 4.0 support is currently **disabled**; if you need .NET 4.0, please stick with 1.2.1 while we keep investigating
# Important: .NET 4.0 support is currently **disabled**; if you need .NET 4.0, please stick with 1.2.1 while we keep investigating
## 2.0-alpha.* (not released)
## 2.0
- this is the 2.0 preview build; please see [this tracking issue](https://github.com/StackExchange/StackExchange.Redis/issues/871)
- 2.0 is a large - and breaking - change
- HARD BREAK: the package identity has changed; instead of `StackExchange.Redis` (not strong-named) and `StackExchange.Redis.StrongName` (strong-named), we are now
only releasing `StackExchange.Redis` (strong-named). This is a binary breaking change that requires consumers to be re-compiled; it cannot be applied via binding-redirects.
- HARD BREAK: the platform targets have been rationalized - supported targets are .NETStandard 2.0 (and above), .NETFramework 4.6.1 (and above), and .NETFramework 4.7.2 (and above)
(note - the last two are mainly due to assembly binding problems)
- HARD BREAK: the profiling API has been overhauled and simplified; full documentation is [provided here](https://stackexchange.github.io/StackExchange.Redis/Profiling_v2.html)
- SOFT BREAK: the `PreserveAsyncOrder` behaviour of the pub/sub API has been deprecated; a *new* API has been provided for scenarios that require in-order pub/sub handling -
the `Subscribe` method has a new overload *without* a handler parameter which returns a `ChannelMessageQueue`, which provides `async` ordered access to messsages)
- internal: the network architecture has moved to use `System.IO.Pipelines`; this has allowed us to simplify and unify a lot of the network code, and in particular
fix a lot of problems relating to how the library worked with TLS and/or .NETStandard
- added: ["streams"](https://redis.io/topics/streams-intro) support
- various missing commands / overloads have been added
- a *lot* of general bugs and issues have been resolved
a more complete list of issues addressed can be seen in [this tracking issue](https://github.com/StackExchange/StackExchange.Redis/issues/871)
