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The following problems have not been fixed at the time of this release:
1- Stream concatenation using [< ... >] does not always preserve the
sharing among streams, and sometimes duplicate stream subcomponents.
For instance, if you define s' = [< '1; s >] and then read alternatively
from s' and from s, a given element of s can be read twice.
The problem occurs only if s is in tail position inside s'.
To guarantee proper sharing, move s in non-tail position, e.g.
take s' = [< '1; s; [<>] >].