Fix formatting in the new mysqli test

Fix bug where large bigints may be truncated

Unless stringified results are requested, we need to parse large
bigints as unsigned, to avoid wrap-around behavior.

Co-authored-by:

Fix bug where large bigints may be truncated

Unless stringified results are requested, we need to parse large
bigints as unsigned, to avoid wrap-around behavior.

Co-authored-by: Christoph M. Becker <cmbecker69@gmx.de>

Closes GH-7837.

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