unpack-tspec.md
In tibblify: Rectangle Nested Lists

only unpack field in `fields`

Code
  (expect_error(unpack_tspec(spec, fields = "not-there")))
Output
  <error/rlang_error>
  Error in `check_unpack_cols()`:
  ! Can't unpack fields that don't exist.
  Field not-there doesn't exist.
Code
  (expect_error(unpack_tspec(spec, fields = c("not-there", "also-not-there"))))
Output
  <error/rlang_error>
  Error in `check_unpack_cols()`:
  ! Can't unpack fields that don't exist.
  Fields not-there and also-not-there don't exist.

names are repaired

Code
  (expect_error(unpack_tspec(spec, names_repair = "minimal")))
Output
  <error/rlang_error>
  Error in `unpack_tspec()`:
  ! `names_repair` must be one of "unique", "universal", "check_unique", "unique_quiet", or "universal_quiet", not "minimal".
Code
  (expect_error(unpack_tspec(spec, names_repair = "check_unique")))
Output
  <error/rlang_error>
  Error in `unpack_tspec()`:
  ! In field y.
  Caused by error:
  ! Names must be unique.
  x These names are duplicated:
    * "b" at locations 1 and 2.