That could be done, but not by default, as this has a big impact on performance, as now every getline () result has to be copied/stored in a location that string () can return to the user.
The solution you post is only viable if the input stream is seek'able, and will not work on pipes. This is one of the reasons why this module is not capable of determining the line characteristics on the fly.
Enjoy, Have FUN! H.Merijn
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