@HB_BUFFER_SERIALIZE_FORMAT_TEXT: a human-readable, plain text format. @HB_BUFFER_SERIALIZE_FORMAT_JSON: a machine-readable JSON format. @HB_BUFFER_SERIALIZE_FORMAT_INVALID: invalid format.
The buffer serialization and de-serialization format used in hb_buffer_serialize_glyphs() and hb_buffer_deserialize_glyphs().
0.9.2