study: use checkedint as a drop-in replacement of native long

[H. S. Teoh]

On Tue, Aug 18, 2020 at 05:39:42PM -0400, Andrei Alexandrescu via Digitalmars-d wrote:
[...]
> https://issues.dlang.org/show_bug.cgi?id=21175
> 
> Not holding my breath.

If someone can kick up a PR for this, the chances would increase
significantly. ;-)


T

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