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Bug #11878

Updated by nobu (Nobuyoshi Nakada) over 4 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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