Bug #11878
Updated by nobu (Nobuyoshi Nakada) over 8 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 ~~~