static boolean canHandle(TensorType type) {
            if (type.rank() != 1) return false;
            var dim = type.dimensions().get(0);
            return (dim.isIndexed() && dim.size().isEmpty());
        }
Parses mixed tensor short form {0:17.0, 1:42.0, ...} used for single unbound dimension
vespajlib/src/main/java/com/yahoo/tensor/TensorParser.java