Retrieves the data from the container referenced by the given RefSymbol. If there is no data available it returns undefined but never throws an exception.
reference
The referenced data from the container or undefined.
Retrieves the data from the container referenced by the given RefSymbol. If there is no data available it throws an exception defined by the container.
reference
The referenced data from the container.
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Subset of container methods. Needs to be implemented to create decorators. Contains read methods from a Container by RefSymbol.