Why do some attributes start with '@' while others done't?

[Luis via Digitalmars-d]

On Thursday, 21 January 2016 at 23:18:16 UTC, tsbockman wrote:

> Adding the @ to the old attributes was discussed as well, but 
> it didn't seem worth the code breakage.
>


And why not add the version of these attributes with @ and 
deprecate these attributes without @ for some time? So it allow 
to change it using tools like dfix.