INCOMPATIBLE CHANGE The labeldate option is renamed to labeldateparts. The datelabel option is renamed to labeldate to provide consistency with all other date options. Backwards compatibility is provided and warnings will be issued.
Currently, trying to compile with Biblatex 3.6 gives:
! Package keyval Error: No value specified for labeldate.
This is because labeldate is now a key that (from the manual) "controls the format of the date field selected with \DeclareLabeldate". labeldateparts now does what labeldate used to do.
If you look at the 3.5 release notes, you'll see:
Currently, trying to compile with Biblatex 3.6 gives:
This is because
labeldate
is now a key that (from the manual) "controls the format of the date field selected with\DeclareLabeldate
".labeldateparts
now does whatlabeldate
used to do.More information on TeX.SX: Why do I get the error “! Package keyval Error: No value specified for labeldate.”?