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Sasa v0.14.0 Released

A quick release, fixing one bug and adding some performance improvements and some new collection types. Here's the changelog:

 * added a faster and more compact hash array mapped trie under Sasa.Collections.Trie to replace Sasa.Collections.Tree
 * added Sasa.Collections.FingerTree
 * added purity attributes throughout Sasa (for .NET 4)
 * expanded various test suites and documentation
 * added a persistent vector, Sasa.Collections.Vector
 * factored out Atomics.BeginRead/BeginWrite read/write protocol so it can be used in more flexible scenarios
 * Sasa.Dynamics.Type.MaybeMutable is now computed eagerly
 * added an efficient, mutable union-find data structure
 * fixed: Uris.UriDecode now handles the incorrect but common UTF16 encoding
 * moved Sasa.LockSet under Sasa.Concurrency.LockSet

The Sasa.Collections.Tree type is no longer available, and is replaced by the faster and more appropriately named Sasa.Collections.Trie. The original tree was actually a trie, and I didn't want it confused with a future search tree type which provides different operations. The FingerTree is an experimental addition, as is Sasa.Collections.Vector which provides a fast immutable array.

Edit: the online docs for the new release are also available here.

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