(cffi:defbitfield key-file-flags
  (:none 0)
  (:keep-comments #.(ash 1 0))
  (:keep-translations #.(ash 1 1)))  

:none

No flags, default behaviour.

:keep-coments

Use this flag if you plan to write the possibly modified contents of the key file back to a file. Otherwise all comments will be lost when the key file is written back.

:keep-translations

Use this flag if you plan to write the possibly modified contents of the key file back to a file. Otherwise only the translations for the current language will be written back.