burn: TxDescriptor<{ keep_alive: boolean; value: bigint }>

Burn the specified liquid free balance from the origin account.

If the origin's account ends up below the existential deposit as a result of the burn and keep_alive is false, the account will be reaped.

Unlike sending funds to a burn address, which merely makes the funds inaccessible, this burn operation will reduce total issuance by the amount burned.