> On May 18, 2016, at 7:35 PM, Nathan Day <nathan_...@mac.com> wrote:
>
> In objective-c I have come across something like this a lot where a
> NSDictionary has been created from JSON an a NSNull is used to represent an
> actual null in the source JSON versus the absence of the key
Yeah, this comes from JavaScript, which weirdly has both ‘null’ and ‘undefined’
values; they’re kind of similar but not the same, and the latter is more like
what we think of as null/nil in Swift or Obj-C. I think this was a bad design,
and unfortunately it crept into JSON, which was based on JavaScript literals.
—Jens
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