--keep-unfinished-download-result[=true|false]
Keep unfinished download results even if doing
so exceeds --max-download-result. This is useful
if all unfinished downloads must be saved in
session file (see --save-session option). Please
keep in mind that there is no upper bound to the
number of unfinished download result to keep. If
that is undesirable, turn this option off.