Lines in JAR manifests can be broken at any point, but in RFC-822 they can only be broken where whitespace is allowed. While this allows for very long names and/or keys in manifests to be used, it is difficult to explain in our docs. When 4842483 is fixed (i.e., the 72-byte long line limit is removed), very long names & keys can be on the same line, removing the need for the current, non-RFC-822-compliant behavior.