The intern package

Changes from 0.8 to 0.9

Removed identity from the Interned class, to support applications where the identity is obtained by other means (e.g. a unique Ptr value)

Changes from 0.7 to 0.8

Disabled cache removal as it was causing problems on large data sets. There is no good way to ensure that both references remain alive long enough to finish comparisons. * Switched to IORef from MVar

Changes from 0.6 to 0.7

Fixed problem where comparisons could happen between data structures while one was still a thunk, leading to equal structures comparing as inequal in limited circumstances, by appropriately using strictness annotations.

Efficient hash-consing for arbitrary data types

Changes from 0.5.2 to 0.6

Widened the caches so they don't go through a single MVar per type. This has made a dramatic impact on performance. However, this broke the previous invariant that newer entries always had higher Ids than older entries.

Changes from 0.5.1 to 0.5.2

Properties

Versions	0.1, 0.2.0, 0.2.2, 0.2.2.1, 0.3.0, 0.4.0, 0.5.0, 0.5.1, 0.5.1.1, 0.5.2, 0.6, 0.8, 0.8.0.1, 0.9, 0.9.0.1
Dependencies	array (0.4.), base (4.), bytestring (0.9.), hashable (1.1.), text (0.11.*), unordered-containers (≥0.2.1 & <0.3)
License	BSD3
Copyright	Copyright (C) 2011 Edward A. Kmett
Author	Edward A. Kmett
Maintainer	Edward A. Kmett <ekmett@gmail.com>
Stability	experimental
Category	Data, Data Structures
Home page	http://github.com/ekmett/intern/
Bug tracker	http://github.com/ekmett/intern/issues
Source repository	git clone git://github.com/ekmett/intern.git
Upload date	Thu May 10 20:37:00 UTC 2012
Uploaded by	EdwardKmett
Built on	ghc-7.4