[Issue 18924] Use addition rather than XOR for order-independent hash combination

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18924

Mike Franklin <slavo5150 at yahoo.com> changed:

           What    |Removed                     |Added
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                 CC|                            |slavo5150 at yahoo.com

--- Comment #2 from Mike Franklin <slavo5150 at yahoo.com> ---
Why?

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