ruby-immutable-ruby - 0.1.0-2 main

The immutable-ruby gem provides 6 Persistent Data Structures: Hash, Vector,
Set, SortedSet, List, and Deque (which works as an immutable queue or stack).
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Whenever you "modify" an Immutable collection, the original is preserved and a
modified copy is returned. This makes them inherently thread-safe and
shareable. At the same time, they remain CPU and memory-efficient by sharing
between copies.
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Immutable was forked from Simon Harris' Hamster library (ruby-hamster
package), which is no longer maintained. It features some bug fixes and
performance optimizations which are not included in Hamster. Aside from the
name of the top-level module, the public API is virtually identical.