- Global apreq_atoi64f  (const char *s)
- What happens when s is malformed? Should this return an unsigned value instead?  
- Global apreq_atoi64t  (const char *s)
- What happens when s is malformed? Should this return an unsigned value instead?  
- Global apreq_brigade_concat  (apr_pool_t *pool, const char *temp_dir, apr_size_t brigade_limit, apr_bucket_brigade *out, apr_bucket_brigade *in)
- Flesh out these error codes, making them as explicit as possible.