Github user PascalSchumacher commented on the issue:
https://github.com/apache/commons-lang/pull/261
If I'm not mistaken the list returned by `getAllSuperclassesAndInterfaces`
can contain the same interface multiple times if it is implemented by more than
one super class. To prevent this the result should be collected in
`LinkedHashSet` first (similar to
https://github.com/yasserzamani/commons-lang/blob/90e252f571377cac39f5e2a3fc73749f589c24de/src/main/java/org/apache/commons/lang3/ClassUtils.java#L448).
What do you think?
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