flag-like options in Slop#to_hash object (take2)

[no6v]

I reimplemented (#58) by tweaking Slop::Option#value.
Saving a flag value during processing options (Slop#process_item),
and return the value immediately if the @value exists and it is true, false or nil.
One more assertion tweaked as well.

[leejarvis]

I'm still not entirely sure about this. It's also a backward incompatible change which means according to semver (which Slop follows), this can't be merged until Slop v4. I'm going to leave it open for more discussion, though. Thanks for putting this work in

[cmol]

I'm in for merging this. It seems strange that you can't get the true/false value from .to_hash, like in the older versions

[lolmaus]

Have come here to post an issue about not being able to retrieve from .to_hash whether argumentless parameters have been set or not.

I vote that the values of argumentless parameters in .ho_hash should be true for specified parameters and false/nil for not specified ones.

[leejarvis]

Thanks for chiming in guys. I'm +1 for this, but it is a backwards incompatible change. It'll have to wait for Slop 4.0

[cmol]

Great, thanks for listening :) But wasn't this the case in older versions? I know I used it, because it broke when i updated my gems ;) But still, great!

[leejarvis]

@cmol Yup that was the case in older versions, and I think I was probably wrong trying to change it. This could perhaps go in as a bugfix instead.

[leejarvis]

Closing this. It's now merged into master and will be available in 3.2.0 as a bugfix