For performance reasons, the unused area of storage is always left as it is when
some elements are removed.
No time is lost to clean the released area with a Void
or a 0 value. (Look for example the remove_last implementation.)
Thus, the unused area of storage may contains references of actually unreachable
objects. The following mark_native_arrays actually replace the
default behavior (the call is automatic) in order to mark only reachable objects.
The basic = is used
for comparison of items and indices are not considered (for
example this routine may yield True with Current indexed in
range [1..2] and other indexed in range [2..3]).
Forces the garbage collector to continue the marking process on the index-th element of
the native_array. The element at index can be Void or not Void (the Void-ness test
performed inside the mark_item itself).
This exception occurs when Void is passed as the expression
to inspect ("inspect on STRING only).
This exception also occurs when the inspected value selects no branch (when the keyword "else"
not used, one "when" branch _must_ be selected). Some value which is not one of the inspect
constants, if there is no Else_part
e