[ruby-core:96788] [Ruby master Feature#16502] Add option :allow_trailing_comma to JSON#parse

Issue #16502 has been reported by j.spanjers (Jan-Joost Spanjers).

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Feature #16502: Add option :allow_trailing_comma to JSON#parse
https://bugs.ruby-lang.org/issues/16502

* Author: j.spanjers (Jan-Joost Spanjers)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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Hello everyone,

I'd like to be able to parse JSON sources that contain trailing commas in arrays and/or objects.

For example,

``` ruby
> JSON.parse('[1,2,3,]')
JSON::ParserError: 416: unexpected token at ']'
```


I have created a [pull request](https://github.com/ruby/ruby/pull/2831) to add the option :allow_trailing_comma to JSON#parse:

``` ruby
> JSON.parse('[1,2,3,]', allow_trailing_comma: true)
[1, 2, 3]
```


I would kindly like to ask you to consider this patch for merging in Ruby core. 


Regards,
Jan-Joost Spanjers


[1] https://github.com/ruby/ruby/pull/2831








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