bson_copy_to_excluding()
Synopsis
void bson_copy_to_excluding (const bson_t *src, bson_t *dst, const char *first_exclude, ...) BSON_GNUC_NULL_TERMINATED;
Description
The bson_copy_to_excluding() function shall copy all fields from src to dst except those speified by the variadic, NULL terminated list of keys starting from first_exclude.
This is generally not needed except in very special situations.