[Issue 18675] std.experimental.checkedint.Checked has opEquals but no toHash

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18675

--- Comment #1 from vladvitan at gmail.com ---
I want to work on this. Could you please give me a starting point for this?
Should I use the toHash() functionality from druntime?

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