On 24 January 2016, Bram Moolenaar <[email protected]> wrote:
>
> Lcd wrote:
>
> > > [...]
> > > > > Actually, since you added two more values for type(), it
> > > > > would make sense to make Bool and Null standard types, Vim
> > > > > citizens with full rights. But some careful consideration
> > > > > would be needed for the interaction with the other types, so
> > > > > that they can also be used for other purposes, unrelated to
> > > > > JSON.
> > > >
> > > > The thing is that the only valid values are what we have now.
> > > > Giving those types a name doesn't really help.
> > > >
> > > > > The alternative would be to make jsondecode() return
> > > > > only standard Vim values (that is, true --> 1, false --> 0,
> > > > > null --> ''), and leave v:<special> only for encoding. Less
> > > > > powerful, but a lot simpler, and a lot more robust.
> > > >
> > > > Then you can't tell the difference between decoding a zero or
> > > > "false". This drops information that might be important. I'm
> > > > sure this will be a problem at a later time.
> > >
> > > Yes, but now we have the worst of the two worlds: types that
> > > aren't quite types, and values that aren't quite values. They'll
> > > break things eventually. Actually, Nikolai Aleksandrovich Pavlov
> > > has a few examples when they do. F.i. eval(string(var)) is no
> > > longer guaranteed to be the same as var.
> > [...]
> >
> > One more thing: adjusting the result of jsondecode() to contain
> > only "standard" values involves deep traversal, which is not
> > trivial. Actually, it's pretty hard to get right.
>
> Example?
Anything nested would do:
:echo jsondecode('[{"a":true, "b":false}, null, {"foo": true, "bar": true,
"baz": null}]')
[{'a': true, 'b': false}, null, {'foo': true, 'baz': null, 'bar': true}]
Replacing all true, false, and null with "plain" 0, 1, and '' means
traversing the leaves of this.
/lcd
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