[Issue 24358] New: std.digest on array of arrays surprisingly shallow

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24358

          Issue ID: 24358
           Summary: std.digest on array of arrays surprisingly shallow
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: schveiguy at gmail.com

std.digest when run on an array of arrays uses a blunt cast to ubyte[], which
means it digests the pointer/lengths, not the contents of the subarrays.

This can be surprising, and in some cases, leave a time bomb for future uses,
because strings are interned.

For example:

`assert (md5Of(["hello", "world"]) == md5Of(["hello", "world"]));`

passes

`assert (md5Of(["hello", "world"]) == md5Of(["hello".dup, "world"]));`

fails.

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I propose that digest on an array of items which contain pointers does not just
cast to ubyte[], but rather uses the (slower) range mechanism of applying
digest to each item individually.

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