Todo List

Global APREQ_COOKIE_MAX_LENGTH
convert this macro to an apreq_module_t method.

Global apreq_atoi64f
What happens when s is malformed? Should this return an unsigned value instead?

Global apreq_atoi64t
What happens when s is malformed? Should this return an unsigned value instead?

Global apreq_brigade_concat
Flesh out these error codes, making them as explicit as possible.