MONGO_EXPORT int bson_append_symbol( bson *b, const char *name, const char *value ) {
    return bson_append_string_base( b, name, value, strlen ( value ), BSON_SYMBOL );
}
MONGO_EXPORT int bson_append_symbol( bson *b, const char *name, const char *value ) {
    return bson_append_string_base( b, name, value, strlen ( value ), BSON_SYMBOL );
}