I tried to add template data for http://ko.wikipedia.org/w/index.php?title=%ED%8B%80:%EC%84%9C%EC%A0%81_%EC%9D%B8%EC%9A%A9/%EC%84%A4%EB%AA%85%EB%AC%B8%EC%84%9C&action=edit, while I wrote following text via TemplateDataEditor:
...
"확인연도": { "deprecated": true, "description": "(해당 항목을 확인한 해)", "aliases":["accessyear"] },
...
And then the MediaWiki engine printed the following message and the data cannot be saved:
Property "params.확인연도.deprecated" is expected to be of type "boolean|string".
It was valid on JSON Lint. However, system does not seem to recognize boolean variable correctly.
Note: When I tried to enter string value, no problems arised. Therefore, the problem is boolean recognition.
Version: unspecified
Severity: major