Phobos function to check if files are identical?

[XavierAP via Digitalmars-d-learn]

On Monday, 13 March 2017 at 17:47:09 UTC, H. S. Teoh wrote:
>
> Binary comparison is easy. Just read the files by fixed-sized 
> chunks and compare them.

Follow up question... What is the best @safe way? Since 
File.byChunk() is @system. Just out of curiosity, I would rather 
use it and flag my code @trusted, although I guess there could be 
concurrency issues I have to take into account anyway... anything 
else?