codec_xpt.md
In artoo: Lossless CDISC-Native Input and Output for Clinical Datasets

a factor column aborts with artoo_error_type

Code
  write_xpt(df, p)
Condition
  Error in `write_xpt()`:
  ! Column `F` is a factor.
  i Convert it with `as.character()` before writing.

write_xpt warns when data widens a spec-declared length

Code
  out <- write_xpt(x, f)
Condition
  Warning in `write_xpt()`:
  Widened 1 column past the declared spec length: "INVNAM (6 -> 8)".
  i Values need more bytes than the spec length; data was kept whole.
  i Update the spec length, or shorten the data, so the file matches its declared metadata.