AGZain

gh-93121: change _sample_headers from a map to list + tuples to allow duplicates

4

Before: https://github.com/python/cpython/blob/b2694ab46997746eae7e913738623b39f6334473/Lib/test/test_mailbox.py#L34-L35 https://github.com/python/cpython/blob/b2694ab46997746eae7e913738623b39f6334473/Lib/test/test_mailbox.py#L2267-L2290 Since `_sample_headers` is a map with duplicate keys (ex: `Received`), not all keys are tested. After: Changed _sample_headers to a list of tuples so all keys are...