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bin/gems/set-1.1.1/README.md

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+# Set
+
+This library provides the Set class, which deals with a collection of
+unordered values with no duplicates.  It is a hybrid of Array's
+intuitive inter-operation facilities and Hash's fast lookup.
+
+The method `to_set` is added to Enumerable for convenience.
+
+Set implements a collection of unordered values with no duplicates.
+This is a hybrid of Array's intuitive inter-operation facilities and
+Hash's fast lookup.
+
+Set is easy to use with Enumerable objects (implementing `each`).
+Most of the initializer methods and binary operators accept generic
+Enumerable objects besides sets and arrays.  An Enumerable object can
+be converted to Set using the `to_set` method.
+
+Set uses Hash as storage, so you must note the following points:
+
+* Equality of elements is determined according to Object#eql? and
+  Object#hash.  Use Set#compare_by_identity to make a set compare its
+  elements by their identity.
+
+* Set assumes that the identity of each element does not change while
+  it is stored.  Modifying an element of a set will render the set to
+  an unreliable state.
+
+* When a string is to be stored, a frozen copy of the string is stored
+  instead unless the original string is already frozen.
+
+### Comparison
+
+The comparison operators `<`, `>`, `<=`, and `>=` are implemented as
+shorthand for the {proper_,}{subset?,superset?} methods.  The `<=>`
+operator reflects this order, or return `nil` for sets that both have
+distinct elements (`{x, y}` vs. `{x, z}` for example).
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+```ruby
+gem 'set'
+```
+
+And then execute:
+
+    $ bundle install
+
+Or install it yourself as:
+
+    $ gem install set
+
+## Usage
+
+```ruby
+require 'set'
+s1 = Set[1, 2]                        #=> #<Set: {1, 2}>
+s2 = [1, 2].to_set                    #=> #<Set: {1, 2}>
+s1 == s2                              #=> true
+s1.add("foo")                         #=> #<Set: {1, 2, "foo"}>
+s1.merge([2, 6])                      #=> #<Set: {1, 2, "foo", 6}>
+s1.subset?(s2)                        #=> false
+s2.subset?(s1)                        #=> true
+```
+
+## Development
+
+After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake test` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
+
+## Contributing
+
+Bug reports and pull requests are welcome on GitHub at https://github.com/ruby/set.
+
+Feature requests should also go to https://bugs.ruby-lang.org/ for wider audience and discussion.
+
+## License
+
+The gem is available as open source under either the terms of the [2-Clause BSD License](https://opensource.org/licenses/BSD-2-Clause).  When bundled with Ruby, you can distribute/modify this program under the same terms of [Ruby](https://www.ruby-lang.org/en/about/license.txt).