// for our data, sharing names fine, shared values are 'meh', but enable
sf.enable(SmileGenerator.Feature.CHECK_SHARED_NAMES);
sf.enable(SmileGenerator.Feature.CHECK_SHARED_STRING_VALUES);
// and although we don't necessarily embed binary data, if we do, better be raw
sf.disable(SmileGenerator.Feature.ENCODE_BINARY_AS_7BIT);
// as to header, trailer: header, absolutely must write and require for reads;
// trailer: let's not; harmless but useless for our uses
sf.enable(SmileGenerator.Feature.WRITE_HEADER);
sf.disable(SmileGenerator.Feature.WRITE_END_MARKER);
sf.enable(SmileParser.Feature.REQUIRE_HEADER);