Description of the change

Use 1 based indexing in showArrayImpl to match both what is done in other parts of the code and native lua indexing

Checklist:

• Added the change to the changelog's "Unreleased" section with a reference to this PR (e.g. "- Made a change (#0000)")
• Linked any existing issues or proposals that this pull request should close
• Updated or added relevant documentation
• Added a test for the contribution (if applicable)