Why not extend do to allow unicode in ID's?

[XavierAP]

On Tuesday, 2 July 2019 at 04:34:42 UTC, Jonathan M Davis wrote:
>
> a character like ±

A good example of a character that should not be allowed in 
identifiers, because it has a meaning of operator (and in general 
in theory we may want to reserve it for such future use).

ISO or Unicode define what, not all, characters are letters or 
alphanumeric:

https://dlang.org/spec/lex.html#identifiers

https://docs.microsoft.com/en-us/dotnet/api/system.char.isletter#remarks