Typesetting is actually correct. In the days of the printing press, it was not feasible to have type blocks for single punctuation marks. The blocks would be too small and fragile. Punctuation marks were appended to the end of the letter. Instead of having a single block with a period (.) they had a block for each letter of the alphabet with a period. (a.), (b.), etc.

Making blocks for both (“,) and (,”) was an unnecessary expense, so they went with (,"), and the convention stuck.

I have heard (and it might be wrong) that cats can eat dog food with no ill effects. They just cannot survive on dog food alone because it does not contain the nutrients necessary for cats.

I’m not talking about a transaction like in a grocery store. I’m taking about contracts. Under contract law, a debt paid in US currency is considered fulfillment of the contract.

Not quite. Any seller can reject any form of payment at the point of sale. But, after a contract has been established, private parties are required to accept U.S. currency as a form of payment.

Hence the words printed on paper money: “THIS NOTE IS LEGAL TENDER FOR ALL DEBTS, PUBLIC AND PRIVATE.”

I get 22 mpg, is that good enough?