The diamond example "TA extends Student, Teacher" seems worse than OO or direct composition. It's either a compiler error or share everything that overlaps.
I would have made the sharing explicit during composition--a Teacher or Student is given the Person instance when constructed, so sharing or not sharing is decided at composition time. To enforce consistency use helper/static methods.
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[ 1.6 ms ] story [ 13.6 ms ] threadThat said plenty of languages don't have inheritance and work just fine.
Traits / Interfaces are a personal sweet spot
I would have made the sharing explicit during composition--a Teacher or Student is given the Person instance when constructed, so sharing or not sharing is decided at composition time. To enforce consistency use helper/static methods.