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The package contains unmodifiable views for List, Map and Set, as well as a fixed-length view for List. The views simply wrap the original collection and forward all allowed calls to it, but throws if calling a modifying method. R=floitsch@google.com Review URL: https://codereview.chromium.org//17315017 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@24229 260f80e4-7a28-3924-810f-c04153c831b5