Vec<String> aren't parsing in clap 3.0

[rajarshimaitra]

After migrating to clap 3.0 from structopt I am observing the vector of strings are not being parsed properly.. Even if we declare the arg as Vec<String> its only reading the first value, creating a vector of 1 item and when encountering the second value throwing an error..

Possible course of actions.

• Figure out whats the correct way to parse vector of strings in clap 3.0.
• If that's not possible for some reason figure out a work around.

Observations

• Vec parsing happens correctly for the top level command, which derives Parser.
• Vec parsing fails at internal subcommand options, like create_tx, compact_filters_options etc. These options cannot derive Parser as Subcommand is already derived for them, and causes conflicting implementation.

[rajarshimaitra]

Closing this in favor of #124 (comment)