Wouldn't it be possible to split getting and setting prefix traits?

[Tony1321969]

          Wouldn't it be possible to split getting and setting prefix traits?

On getting, a value would be returned, when it has been set or the prefix trait has a default value. On the latter case, the prefixed trait could be created.
Setting would work just as it is currently.

Then no trait would exist where getting raises an exception.

Would this break the current functionality of prefix traits?

Originally posted by @felixkol in #1753 (comment)