[Issue 18766] New: std.typecons.Tuple.toHash could be improved

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18766

          Issue ID: 18766
           Summary: std.typecons.Tuple.toHash could be improved
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: n8sh.secondary at hotmail.com

Current std.typecons.Tuple has a custom `toHash` that is just the sum of the
hashes of the tuple's fields.

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