# The low-level storage of the items.
	#
	# Internally, there is two main configurations
	#
	# One part: from `head` to `tail` (inclusive)
	#
	# ~~~raw
	# ...0123...
	#    h  t
	# ~~~
	#
	# Two parts: from `head` to `capacity-1`,
	# then from `0` to `tail` (both inclusive)
	# Test with `head > tail`
	#
	# ~~~raw
	# 345....012
	#   t    h
	# ~~~
	#
	# For consistency, *length* and *index* are used in the context of the sequence (self) and
	# *capacity* and *offset* are used in the context of the native array.
	#
	# Initially the native is not allocated, the first one is done with `enlarge`
	private var native: NativeArray[E] is noautoinit