0.4.1.0 Add IntervalSet. Minor performance tweaks. Documentation updates. Moved to GitHub. 0.4.0.1 Documentation update. Wrong portability info fixed. 0.4.0.0 Major update adding support for user-defined key intervals. 0.3.0.3 Updated benchmark to use Criterion 1.0. Tested with ghc 7.8.3. 0.3.0.2 Dropped upper constraint on criterion. Tested with ghc 7.6.3. Migrated repo to Darcs Hub. 0.3.0.1 Bugfixes: Lazy was too strict, Strict too lazy. 0.3.0.0 Split into Lazy and Strict modules, following containers.