..generic:
  git2rdata: 0.4.0
  optimize: no
  NA string: NA
  sorting: nr
  hash: 4fbba4d68d1987c519ed4d483f4abbbb51c18a0a
  data_hash: aaddc1b35b04dc45cb81e6830bbcfb8725385c3e
name:
  class: character
col:
  class: character
group:
  class: character
letter:
  class: character
nr:
  class: integer