`.do` arguments not passed correctly

The current implementation of the callback chain in 5a-chain passes data from the previous callback but doesn't pass arguments explicitly mentioned in .do().

In usage example readConfig callback is expected to receive myConfig as an argument.

const startChain = chain()
  .do(readConfig, 'myConfig')
  .do(selectFromDb, 'select * from cities')
  .do(getHttpPage, 'http://kpi.ua')
  .do(readFile, 'README.md');

However it receives undefined instead.

So if callbacks would really depend on the previous one the chain would fail once it was called.

Also, should only the first callback in the chain receive an explicit argument, and the following ones receive their arguments from the previous one? Or should they receive both explicit and implicit arguments?

Beginne mit der Untersuchung der Callback-Ketten-Implementierung in 5a-chain und des Verwendungsbeispiels, das readConfig, selectFromDb, getHttpPage und readFile zeigt. Verfolge, wie Argumente durch jeden .do()-Aufruf weitergegeben werden, und überprüfe anschließend, dass die dokumentierten Callbacks die erwarteten expliziten und vorherigen Callback-Argumente statt undefined erhalten.