0.32

New Features

• #1079 Transactional is now implemented for
  [&Tree] and [Tree] so you can avoid the
  previous friction of using tuples, as was
  necessary previously.
• #1058 The minimum supported Rust version (MSRV)
  is now 1.39.0.
• #1037 Subscriber now implements Future (non-fused)
  so prefix watching may now be iterated over via
  while let Some(event) = (&mut subscriber).await {}

Improvements

• A large number of crash consistency issues have
  been discovered during intensive testing and fixed.
• #965 concurrency control is now dynamically enabled
  for atomic point operations, so that it may be
  avoided unless transactional functionality is
  being used in the system. This significantly
  increases performance for workloads that do not
  use transactions.
• A number of memory optimizations have been implemented.
• Disk usage has been significantly reduced for many
  workloads.
• #1016 On 64-bit systems, we can now store 1-2 trillion items.
• #993 Added DerefMut and AsMut<[u8]> for IVec where it
  works similarly to a Cow, making a private copy
  if the backing Arc's strong count is not 1.
• #1020 The sled wiki has been moved into the documentation
  itself, and is accessible through the doc module
  exported in lib.

Breaking Changes

• #975 Changed the default segment_size from 8m to 512k.
  This will result in far smaller database files due
  to better file garbage collection granularity.
• #975 deprecated several Config options that will be
  removed over time.
• #1000 rearranged some transaction-related imports, and
  moved them to the transaction module away from
  the library root to keep the top level docs clean.
• #1015 TransactionalTree::apply_batch now accepts
  its argument by reference instead of by value.
• Event has been changed to make the inner fields
  named instead of anonymous.
• #1057 read-only mode has been removed due to not having
  the resources to properly keep it tested while
  making progress on high priority issues. This may
  be correctly implemented in the future if resources
  permit.