Use Optional and Tuple to test decorator #1691

Job	Run time
Mypy	1m 44s
Examples Conda Py3	1m 26s
Tests for downstream project meshmode	13m 28s
Documentation	1m 50s
Pytest Conda Py3 Intel	2m 11s
Pylint	1m 37s
Tests for downstream project grudge	10m 48s
Pytest Conda Py3 POCL	2m 23s
Tests for downstream project mirgecom	4s
Tests for downstream project mirgecom_examples	3s
Ruff	6s
Typos	5s
	35m 45s

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