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Fixed ordering issues with Set on Ruby 1.8.7.
Include Permute::Mixin into Set.
Put all monkey patches in extensions/ directories.
Removed aliases from Choose::Mixin and Permute::Mixin.
Make sure choose filters out repeated elements.
No need for zero?, 0.0 == 0.
Changed Combinatorics::PowerSet::Mixin to use Choose::Mixin.
Changed choose to always return Sets.
Alias choose to combinations.
Updated an @example.
Fixed another spec.
Fixed broken specs.
Allow Choose.cardinality_all to accept a Range of r values.
Removed old specs.
Added more missing should assertions.
Fixed a typoed spec.
No longer inject Derange::Mixin into Set, since Sets lack order.
* Sets also lack insertion order under 1.8.x.
Rewrote cartesian_product to use Array#list_comprehension.
Use =~ to ignore ordering issues with Set on Ruby 1.8.
Fixed more usage of Array / Set.
Fixed the Choose specs, was a simple typo with Array / Set syntax.
Sigma of 3..5 is 12.
Added more missing should asserts.
Added missing should asserts to the Choose::Mixin examples.