String with truncating behavior

[lelongg]

It might be desirable to have a string with truncation behavior when it is written beyond its capacity.

[reitermarkus]

Can you clarify what the use case would look like for this?

[lelongg]

A use case would be to have a non-panicking behavior when the string content is not vital, for logs for example. One might prefer to not have the full content and still carry on.

[newAM]

I agree not panicking is useful. I think we nay have fixed this since the issue was opened. Is this covered by the fix for #381?

I don't think we have any append or conversion methods in String that panic anymore, but I am on my phone so I haven't checked.

[lelongg]

The particular use case I had was with the Write trait which can only panic on overflow.