Map<String, String> generation failed

We are using your tool and having problems parsing a Map<String, String> into dart. It seems it is some kind of string formatting error where > and < are not correctly translated. We assumed the bug could be around here:

https://github.com/OpenAPITools/openapi-generator/blob/123119c07614b8dcda63224b2cedcae52c069685/modules/openapi-generator/src/main/resources/dart/libraries/dio/serialization/built_value/serializers.mustache#L32

Maybe it has something to do with the mustache definition here (https://mustache.github.io/mustache.5.html):

Template:

• {{name}}
• {{age}}
• {{company}}
• {{{company}}}
  Hash:
  {
  "name": "Chris",
  "company": "GitHub"
  }
  Output:
• Chris
• <b>GitHub</b>
• GitHub

How we found it after api generation was this:

Start with modules/openapi-generator/src/main/resources/dart/libraries/dio/serialization/built_value/serializers.mustache at the referenced line, then inspect the generated Dart serialization for a Map<String, String>. Compare the template's escaping behavior with the Mustache documentation and reproduce the reported output. Done means generated Dart preserves the angle brackets and parses the map correctly.