in serialization/src/main/java/com/twitter/serial/serializer/CollectionSerializers.java [139:148]
private static <T> void serializeSet(@NotNull SerializationContext context,
@NotNull SerializerOutput output, @Nullable Set<T> set,
@NotNull Serializer<T> itemSerializer) throws IOException {
if (!SerializationUtils.writeNullIndicator(output, set)) {
output.writeInt(set.size());
for (T item : set) {
itemSerializer.serialize(context, output, item);
}
}
}