I'd like to create a function
(deposit-fungible-v2-burn (account:string amount:decimal token:module{fungible-v2}))
that burns amount tokens from the account.
Are there any functions in the fungible-v2 interface for minting/burning coins?
It is perhaps possible to use ROOT account from the token contract, but in that case ROOT would not be an eater account as this account can send(mint) tokens. It is also possible to use custom logic in the token contract itself, but in that case I would not be able to generalize the function for all fungible-v2 tokens.
No, though I believe the credit/debit functions provide similar functionality. To my knowledge, the burn function from ERC-20 is actually part of an extension to the ERC-20 standard and is not part of the standard itself (see https://docs.openzeppelin.com/contracts/3.x/api/token/erc20#ERC20Burnable ).
You could always try adding your own KIP here to add an extension interface: https://github.com/kadena-io/KIPs