Timestamp in seconds, like localtime(), when the buffer was last used.
listed: boolean
TRUE if the buffer is listed.
lnum: number
Line number used for the buffer when opened in the current window.
Only valid if the buffer has been displayed in the window in the past.
If you want the line number of the last known cursor position in a given
window, use line():
:echo line('.', {winid})
linecount: number
Number of lines in the buffer. (only valid when loaded)