Instead of injecting spaces to ensure that lines stay under 76 characters only wrap at whitespace characters. This avoids changing the headers.
A best-effort to keep lines under 76 characters is still done, however it is only done at whitespace. Notably there is no hard wrap enforced. This means that it is possible for headers to break the 1000 character line-length limit in the specification. It is just hoped that the receiver will allow long lines in this case.
Closes#688
Co-authored-by: Kevin Cox <kevincox@kevincox.ca>
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