readr 2.1.6

• locale(encoding =) now warns, instead of errors, when the encoding cannot
  be found in the return value of iconvlist(). The motivation is to remove an
  unnecessary blocker on platforms, such as Alpine Linux, where the output of
  iconvlist() does not reflect the actual capabilities (@bastistician, #1537).

• Help files below man/ have been re-generated, as part of the effort to
  support HTML reference manuals on CRAN.

• readr no longer uses SETLENGTH(), SET_TRUELENGTH(), or
  SET_GROWABLE_BIT(). This change improves C API compliance, with a small
  performance cost affecting only the legacy first edition parser.