zendframework/zf2 — pull request #4931 by denis-sokolov (2013-08-06 10:32:52+00:00)
Title: Mime\Message: createFromString: really ignore unknown headers

It is confusing that createFromString throws an exception that can't be ignored on such a small detail as an unknown header, especially given that unknown headers can be quite popular. For example, an `X-Attachment-Id` header.

It is more confusing that the exception claims to ignore the unknown header, while, of course, it's an exception.
So it doesn't ignore it.