Paul Ganssle <p.gans...@gmail.com> added the comment:

Responding to a comment on the PR:

> Now, that said you might want to consider the fact that in 
> _fold_mime_parameters I deal with this issue by bumping maxlen to 78 rather 
> than raising an error. I'm not sure that was the right choice, but whatever 
> we do, it should probably be made consistent between the two cases.

So I think in an ideal world this would be consistent between the two, but I 
*also* think that the right solution is to raise an exception rather than 
silently coercing, and changing this in _fold_mime_parameters would be a 
backwards-incompatible change.

I think that if you agree that an exception is better, maybe the path forward 
is to raise an exception in this case and switch the _fold_mime_parameters case 
over to raising a warning, which will be turned into an exception in a later 
release (3.10 maybe).

> It is so sad that I never came back to fix that XXX comment I left myself :(

I'm glad that the XXX comment was at least there! Otherwise I wouldn't have 
notice that there was anything to fix!

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