-preview=in might break code

Sun Oct 4 23:31:03 UTC 2020

On Sunday, 4 October 2020 at 23:17:03 UTC, kinke wrote:
> On Sunday, 4 October 2020 at 23:06:58 UTC, Ola Fosheim Grøstad 
> wrote:
>> You need to know the implementation as parameters can alias 
>> with globals accessed by the function. So not caller only.
>
> As-is with all refs today:

The context for that statement was that value/ref is 
implementation dependent.

Steven also gave another example related to type testing.

All such anomalities should be listed.