Non-optional values

[kohtenko]

The idea taken from SwiftyJSON. It's really useful in cases, when you don't want care about optionals.

[radex]

That does look useful. Not sure about NSDate() since it represents the current, not "empty" date, but 0, [], [:], "", etc. often do make sense.

[kohtenko]

I agree, made this value 0 in unixtime on 3b9c29b

[radex]

Still don't know about this… Is 1970 a natural, obvious "null value" that we want people to use, implicitly?

[kohtenko]

I believe this value is "default enough" :) If someone wants to make sure about null value - there is date and hasKey methods.
unixtime 0 always been debatable value, but everyone knows that this is 01.01.1970

[radex]

Hm, I'll think about this.

Not merging this PR just yet, but I will ;)

[radex]

Merged. Thanks.

I removed objectValue and dateValue before merging. I'm not convinced of the usefulness of their default value behavior. I'd rather people do this explicitly.

(If people complain about this and make a convincing argument for it, I'll put it back.)