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Bug #11878

Updated by nobu (Nobuyoshi Nakada) over 3 years ago

Including module `B` to class/module `A` gives the following results (as expected):

~~~ruby ~~~
module A; end
module B; end
A.include B
A < B # => true
B < A # => false
A <=> B # => -1
~~~

And prepending module `C` to `A` gives the following results:

~~~ruby ~~~
module C; end
A.prepend C
A < C # => true
C < A # => nil
A <=> C # => -1
~~~

It looks like including and prepending almost do not make difference with respect to module comparison, i.e., `A < B` and `A < C` are the same, and `A <=> B` and `A <=> C` are the same. However, then, the difference between `B < A` and `C < A` stands out unexplained. I suppose this is a bug. If `C < A` were to return `false`, then it would be at least consistent.

However, if that was what was intended, then at least to me, it is strange. In that case, I would like to make this a feature request. I would rather expect:

~~~ruby ~~~
A < C # => false
C < A # => true
A <=> C # => 1
~~~

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