balance method
Like coin but produces a Balance<[type]> value — for Move functions
that take a balance directly, and for gasless address-balance transfers
(e.g. 0x2::balance::send_funds<T>).
Implementation
TransactionResult balance(String type, BigInt balance,
{bool useGasCoin = true}) =>
_coinWithBalanceIntent(type, balance, 'balance', useGasCoin);