Would it make sense to add set to ARRAY_TYPES?

[oittaa]

What do you think? For example people might have a list and then cast it as a set to remove duplicates.

tomli_w/_writer.py

ARRAY_TYPES = (list, set, tuple)

tests/test_types.py

def test_set():
    obj = {"test-set": {1, 2, 3}}
    assert (
        tomli_w.dumps(obj)
        == """\
test-set = [
    1,
    2,
    3,
]
"""
    )

[hukkin]

I think I'd prefer not doing this.

list and tuple are intuitive to me because they are ordered, so are TOML arrays. A set is unordered. E.g. in your test case there's no way of guaranteeing that the order is what you have in the expected TOML string.

E.g. json.dumps from the standard library also errors on sets.