`.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?

Comienza inspeccionando la implementación de la cadena de callbacks en 5a-chain y el ejemplo de uso que muestra readConfig, selectFromDb, getHttpPage y readFile. Traza cómo se pasan los argumentos a través de cada llamada a .do() y, después, verifica que los callbacks documentados reciban los argumentos explícitos y del callback anterior esperados en lugar de undefined.