Why is lineno required when creating Transactions in an importer?

[Oon-Ee Ng]

So creating a new Transaction looks something like the below:-

            meta = data.new_metadata(file.name, lineno)
            txn = data.Transaction(
                meta, date, self.FLAG, None, description,
                data.EMPTY_SET, data.EMPTY_SET, [
                    data.Posting(account_name, amount_val, None, None,
None, None),
                    data.Posting(account_name_2, -amount_val, None, None,
None, None)
                ]
            )

If I don't specify metadata at all (use an empty dictionary) then it will
throw a KeyError from line 586 in core/data.py in entry_sortkey

But if I just specify a nonsense value (identical across all transactions)
it works, and doesn't affect anything else.

Does it make more sense not to require metadata at all when creating
Transactions?

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