I did a squash-commit of that. (So now you want to reset --hard your branch instead of merge it, or remove it and refork later.)

But it crashed in tests. Now we do need that _m_attr initialization I told you was superfluous in the begin () case--for the end () case not to be uninitialized. (I did that, but with a proper initialization rather than leaving the surely-won't-ever-be-touched fields garbage just in case.)

Thanks, Roland