Disable Tab character print-out

Seems that when a suggestion doesn't match the current value, pressing **tab** simply outputs a tab character. I find this to be a bit counterintuitive and have seen other auto-complete functions on numerous platforms simply deny the addition of a tab character.

Take bash/sh for example - pressing tab when there's no autocomplete possibility simply prevents any output. It'd be great to change the behaviour here, or simply add an option for it. What do you think?

No source files or tests are identified. Start by tracing how the CLI handles Tab when a suggestion does not match the current value, then determine whether the intended behavior is to suppress the character or expose an option. Done means the chosen behavior is implemented and covered for an unmatched autocomplete attempt.

Written by the indexing model from the issue text.