blank line. The optional GPG signature is `contents:signature`. The
first `N` lines of the message is obtained using `contents:lines=N`.
Additionally, the trailers as interpreted by linkgit:git-interpret-trailers[1]
-are obtained as 'contents:trailers'.
+are obtained as 'trailers' (or by using the historical alias
+'contents:trailers').
For sorting purposes, fields with numeric values sort in numeric order
(`objectsize`, `authordate`, `committerdate`, `creatordate`, `taggerdate`).