ledger

Problem

isBlockhashValid is a useful RPC call for checking if a transaction needs to be resigned with a new blockhash, but it isn't available in web3.js

Proposed Solution

Add support for it on Connection. More information about the call at https://docs.solana.com/developing/clients/jsonrpc-api#isblockhashvalid

As an intermediate step towards #1015, and various parts thereof, would it be possible to ignore the syntax for features not currently supported, yet use the parts which are supported in trades?
I'm thinking out loud and wondering what effects this may have.

My end goal here is to be able to read a data file https://gitlab.com/snippets/1856416 without errors. Hledger would be able to parse thi

this is the natural behavior of node-hid but we should backport this behavior to all other transports.

basically it's a failsafe for race conditions.

if you open() a transport, you are responsible to close() it in a finally, if an open() happens during that time it should throw if it concerns the same device (e.g. by path id / by uuid, ... depending on the transport)

Thinking to just have it dump the raw wallet files to a file would be useful, especially for some older wallet types.