Weak values will be garbage collected once they are weakly reachable. This makes them a poor candidate for caching; consider {@link #softValues} instead.
Warning: when this method is used, the resulting map will use identity ( {@code ==}) comparison to determine equality of values. This technically violates the specifications of the methods {@link Map#containsValue containsValue}, {@link ConcurrentMap#remove(Object,Object) remove(Object, Object)} and{@link ConcurrentMap#replace(Object,Object,Object) replace(K, V, V)}, and may not be what you expect. @throws IllegalStateException if the value strength was already set @see WeakReference
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