Returns true if the given document
is empty.
Prepares a writer from the given serialization function.
(Since version 0.19.1) Internal: will be made private
(Since version 0.19.1) Internal: will be made private
(Since version 0.19.1) Internal: will be made private
(Since version 0.19.1) Internal: will be made private
(Since version 0.19.1) Internal: will be made private
(Since version 0.19.1) Internal: will be made private
(Since version 0.19.1) Internal: will be made private