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* if an item is streamable, its value will be retrieved, and a new item containing the value will be returned.
* other, non-streamable items will simply be passed through.
Materialization is helpful advisable if a value is to be processed more than once, and is expensive to retrieve. It is even get mandatory if whenever a value will be is invalidated before it is processed requested (see the example below).
|-
| '''Example'''
|-
| '''Summary'''
|Checks if whether the specified {{Code|$item}} is streamable.
|}
