is " has no compiler-defined `deep_twin' or `is_deep_equal' because the corresponding allocated size is not part of the NATIVE_ARRAY object. The client class of this NATIVE_ARRAY type is supposed to use a `capacity' attribute which contains the corresponding number of allocated items (see STRING or ARRAY for example)."
constant attribute
{}
{ARRAY[CHARACTER] 1, << 'a', 'b', 'c', 'd', 'e' >> } {FAST_ARRAY[INTEGER] << 1, 2, 3 >> }