ExperimentalReadonly ExperimentalbatchReadonly ExperimentaldroppedAttribute names present on the converted features that no column binding
carried into the batch, sorted and deduplicated so the report is
deterministic. Always empty unless unmappedAttributes: "drop" was set.
Readonly Experimentalmetrics
A created batch plus the explicit statement of what did not fit in it.
droppedAttributesis empty for every conversion that did not opt in to dropping, which is the default, so a caller that never setsunmappedAttributescan treat a returned result as lossless without checking.