With regards to this proposal, `__toString` is not going to be removed from `HeaderValuesInterface`. I'm open to removing it from `MessageInterface` or `HasHeadersInterface`, but I don't see the harm in including it. I am VERY hesitant to remove it from `StreamInterface` for the reasons outlined in the comment about StreamInterface (see comment number 9,524).

> Better then __toString() is just getMessageString() or similar, clearly named, and explicitly written out. 

I disagree with this. PHP provides a built-in mechanism for representing objects as strings. Not using that and using something is not more clear.