first set of handles allocated returns an uninitialized handle

[ogam]

When you start to create handles the first_index being 1 will cause you to go from m_count 0 => 2 and m_capacity 0 => 8,
last_index will get an bad handle on the very first set of handles, all handles afterwards seems to be fine.

second and later allocation times this grows it'll be m_count 2 => 16 and m_capacity 8 => 16 and won't cause any invalid handles