Rolf, I'm aware of the solution you proposed, but it is unpractical for me, most of the times I'm dealing with large hash structures and big input data, it's inefficient to initialize everything just to avoid an error; in fact, I'm usually don't even want to supress the error (this usually means the input data is wrong and I need to deal with it), I just want a quicker way to determine which variable is involved.
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