How do you know it didn’t throw an error? (Gateway errors would be in the gateway log.)
Just want to reiterate what Paul said.
Datasets themselves are a more generic structure that are used in other places in Ignition than just the tag system. Columns can be of any type... until you intend to write that dataset to a tag, in which case you're restricted to the types the system knows how to serialize.
8.1.15 has now been released:
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