Follow-up from "Draft: Resolve "Standard data types: Atoms""

The following discussion from !73 (merged) should be addressed:

• @jk7683 started a discussion:

  This assumes one-dimensional arrays. This should be fixed or the implementation of IntArray should be totally re-thought. See https://git.scc.kit.edu/virtmat-tools/vre-language/-/issues/104#note_583667