fn mime_split(raw: &[u8], content: bool) -> Option<usize>Expand description
Where the MIME-Version: 1.0 line open adds after a message’s outer
headers starts, when nothing of MIME comes before it; with content,
only when a content’s header follows it (what open rebuilt from an
entity with headers of its own). Without, whatever follows: an entity
with an empty head, or none, rebuilt so (review of 19 October 2026, N7).