Handle "yes" and "no" as valid boolean type

[kuzalekon]

I propose to give the opportunity to set Boolean values ​​also using yes and no.

[af]

Thanks for the PR!

Is this a commonly used boolean format? I haven't seen it before, and if it's not widely used I think it probably makes sense to create your own custom validator for this instead, rather than overloading the built-in boolean one.

I wouldn't want this to give users an unexpected result, and it's technically a breaking change.

[kuzalekon]

Hi, @af !

I think it's a pretty good idea to make it possible to use this method of setting boolean values ​​in the configurations that people work with :)

Also, this is a relatively common case where values ​​such as yes/no/y/n/on/off are recognized as boolean.
For example, here are several libraries with this approach:

• JS (znv, yn)
• Python (configparser)
• PHP (parse_ini_file, ini_get)

If you decide to approve this PR, I can also add so values like y/n/on/off ​​are also recognized as boolean.

[af]

@kuzalekon Thank you for the references! That definitely eases my concerns. I will let this sit for a few more days to see if anyone has any concerns, but the rationale and changes make sense 👍