Astar.HeapMap

Specs:

• add(t, pri, key, val) :: t

Specs:

• delete(t, token, key) :: t

Specs:

• empty?(t) :: boolean

Specs:

• get_by_key(t, key) :: val

Specs:

• mapping(t, key) :: {token | nil, val | nil}

Specs:

• new :: t

Specs:

• pop(t) :: {pri, key, t}