Function seal_apart 

fn seal_apart(
    sharing: &Sharing<'_>,
    stores: &[Store],
    key: &str,
    value: &str,
    sealed: &mut Sealed,
    problems: &mut Vec<String>,
    now_ms: i64,
) -> bool

A file sealed apart put in the folder before its record goes out (blobs); false when it could not be (it changed while read, a full disk): its record waits for the next look. Anything else needs nothing.