A language plugin using the cache should create Node with valid hash,
antecedents and language and then pass it to tryFindNode. If there is a cached
node in the cache, it will be returned back (possibly with value set). If no, the
cache just returns the newly created node.
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When constructing a dependency graph, the
bindoperation of `LanguagePlugin gets an instance ofNodeCacheas an argument. The cache can be used to find a previously created node which may already contain an evaluatedvalue.