The Transaction class has a .toXDR() method, but I don't see a fromXDR method.
I want to persist transactions in XDR base64, then load them, sign them, and send them.
There is a mention of a fromXDR method in the Transaction class here:
get Transaction object from xdr base64 string
but it's not in the doc: https://stellar.github.io/js-stellar-sdk/Transaction.html or even in the code...