JsonSlurper parses wrong JSON

json-slurper.groovy

Groovy Shell (2.4.7, JVM: 1.8.0_121)
Type ':help' or ':h' for help.
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groovy:000> import groovy.json.JsonSlurper
===> groovy.json.JsonSlurper
groovy:000> import groovy.json.JsonParserType
===> groovy.json.JsonSlurper, groovy.json.JsonParserType
groovy:000> parser = new JsonSlurper().setType(JsonParserType.INDEX_OVERLAY)
===> groovy.json.JsonSlurper@36060e
groovy:000> parser.parseText('''\
groovy:001> {
groovy:002> "name": "web",
groovy:003> "tags": ["windows"],
groovy:004> },
groovy:005> ''')
===> [name:web, tags:[windows]]
groovy:000> wrongJson = '''\
groovy:001> {
groovy:002>   "name": "web",
groovy:003>   "tags": ["windows"],
groovy:004> },
groovy:005> '''
===> {
  "name": "web",
  "tags": ["windows"],
},

groovy:000> parser.parseText(wrongJson)
===> [name:web, tags:[windows]]
groovy:000> 

% jsonlint-php <<EoF
{
"name": "web",
"tags": ["windows"],
},
EoF
Parse error on line 3:
...tags": ["windows"],},
---------------------^
Expected: 'STRING' - It appears you have an extra trailing comma