# this was usually returned from database storage. A primitive data normalizer
# has been introduced to get the casted value instead.
bc_primitives_as_strings: false
+# Before Drupal 8.3, timestamps were always returned as Unix timestamps, which
+# are not a universal format for interchange. Now, RFC3339 timestamps are
+# returned. New Drupal installations opt out from this by default (hence this
+# is set to false), existing installations opt in to it.
+# @see serialization_update_8301()
+# @see https://www.drupal.org/node/2768651
+bc_timestamp_normalizer_unix: false