This caused a few bugs for us / confusion. The final keyword is accepted inside 
a trait but it the class also defines a method without the final keyword this 
takes precedence.

Two solutions:
Enforce final when a trait defines - 
https://whisky.macvicar.net/patches/0001-If-a-trait-declares-a-method-as-final-enforce-that.patch

Prohibit final form being used in a trait - 
https://whisky.macvicar.net/patches/002-traits-Disable-use-of-final-keyword.patch

I'm for the first solution here

- S
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