digest creates hash digests of arbitrary R objects (using the 'md5', 'sha-1', 'sha-256', 'crc32', 'xxhash' and 'murmurhash' algorithms) permitting easy comparison of R language objects.
Just like release 0.6.13 a few weeks ago, this release accomodates another request by Luke and Tomas and changes two uses of
MAYBE_REFERENCED which helps in the transition to the new reference counting model in R-devel. Thierry also spotted a minor wart in how
sha1() tested type for matrices and corrected that, and I converted a few references to https URLs and correct one now-dead URL.