dynamically-sized buffer of elements
index of next element to fill
How deep have we gone?
Get and remove first element in queue
Return element {@code i} elements ahead of current element. {@code i==0} gets current element. This is not an absolute index into {@link #data} since {@code p} defines the start of the real list.
Return string of current buffer contents; non-destructive
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A queue that can dequeue and get(i) in O(1) and grow arbitrarily large. A linked list is fast at dequeue but slow at get(i). An array is the reverse. This is O(1) for both operations.
List grows until you dequeue last element at end of buffer. Then it resets to start filling at 0 again. If adds/removes are balanced, the buffer will not grow too large.
No iterator stuff as that's not how we'll use it.