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I have implemented drop for the lzmawriter so that it is not mandatory to run finish().
I have unfortunately run into situations where it was no longer possible for me to execute finish(). For this purpose I have implemented what is executed in finish() in Drop. With finish(), however, the return value must then be adjusted (see pull request).
With Drop you don't get any feedback in case of an error - but you wouldn't if finish() wasn't executed.
I see no disadvantage here at the moment.