..generic:
  git2rdata: 0.5.0
  optimize: no
  NA string: NA
  sorting: jaar
  hash: 8c81d05fec20545a9d6a3cb49e57a9630765ba0b
  data_hash: ea54c77a2e82d56d29a26ec460c2ac2ef2a133cf
jaar:
  class: integer
grassen:
  class: integer
berk:
  class: integer