[vim] jsondecode() parses incorrect JSON (#593)

[Nikolai Aleksandrovich Pavlov]

With Vim 7.4.1165 try jsondecode('[,]'). This will produce [v:none], but this string is not a correct JSON. jsondecode('[1,]') produces [1], but JSON spec does not allow trailing commas. jsondecode('{1: 1,}') produces {'1': 1}, but JSON spec does not allow non-string keys or trailing comma.

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[Nikolai Aleksandrovich Pavlov]

Also jsondecode('1.') produces 1.0, but JSON spec does not allow omitting number after decimal point.

[Bram Moolenaar]

Nikolai Pavlov wrote:

> With Vim 7.4.1165 try `jsondecode('[,]')`. This will produce

> `[v:none]`, but this string is not a correct JSON.
> `jsondecode('[1,]')` produces `[1]`, but JSON spec does not allow
> trailing commas. `jsondecode('{1: 1,}')` produces `{'1': 1}`, but JSON
> spec does not allow non-string keys or trailing comma.

jsondecode() allows for a bit more than the standard. I'll update the
documentation. This takes it a bit in the direction of what JavaScript
eval() does.

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[Christian Brabandt]

Closed #593.

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