..generic:
  git2rdata: 0.4.0
  optimize: no
  NA string: NA
  sorting: nr
  hash: 4fbba4d68d1987c519ed4d483f4abbbb51c18a0a
  data_hash: e9a53e845737762bb2f936bc747cfb316a53ad10
name:
  class: character
col:
  class: character
group:
  class: character
letter:
  class: character
nr:
  class: integer