Trait documentation wrong

[xenoterracide]

I saw this

Traits provide a mixin composition mechanism that is missing in Java. Similar to interfaces in Java, traits are used to define object types by specifying the signature of the supported methods. Unlike interfaces, traits can be partially implemented; i.e. it is possible to define implementations for some methods.

Obviously this is not true as of Java 8, which is 7 years old now. Also the official definition of a Trait https://en.wikipedia.org/wiki/Trait_(computer_programming)

while a trait defines behaviors via full method definitions: i.e., it includes the body of the methods. In contrast, mixins include full method definitions and may also carry state through member variable, while traits usually don't.

It looks like you have a mixin as it can have member variables. Of course language in the programming world has often propagated Trait's and Mixin's as synonyms. So it's not a big deal.