SliceFlagSeparator can affect subcommands, whereas DisableSliceFlagSeparator does not.

[chenlein]

Checklist

• [y] Are you running the latest v3 release? The list of releases is here.
• [y] Did you check the manual for your release? The v3 manual is here.
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What problem does this solve?

That can influence subcommands by setting the DisableSliceFlagSeparator parameter in the top-level command.

Solution description

As the behavior of the DisableSliceFlagSeparator parameter shoud be consistent with that of SliceFlagSeparator

Describe alternatives you've considered

set DisableSliceFlagSeparator flag for all subcommands!