readline fails to understand options.

[Bize Ma]

This works:

     $ bind 'set enable-bracketed-paste on'; bind -v | grep 'bracketed'
     set enable-bracketed-paste on

However, almost any variation of the parameter "on" is not understood by
readline:

     $ bind 'set enable-bracketed-paste on .'; bind -v | grep 'bracketed'
     set enable-bracketed-paste off

     $ bind 'set enable-bracketed-paste "on"'; bind -v | grep 'bracketed'
     set enable-bracketed-paste off

Without any error or warning !!

It appears to fall to default value, while this:

     $ bind 'set bell-style on' ; bind -v | grep 'bell-style'
     set bell-style audible

     $ bind 'set bell-style onf' ; bind -v | grep 'bell-style'
     set bell-style audible

Stays at its last value.

It seems that the parser for this options is unable to process anything
after a valid parameter. And it doesn't emit an error or warning either.

Since the parser needs some improvement: Could it be possible to add the
capability to detect  a `#` after the options as a comment ?

Please read:
https://unix.stackexchange.com/questions/487037/why-is-my-readline-inputrc-configuration-being-ignored/487285#487285