Description of the problem:

{'error': \{'message': '_a.toUTCString is not a function', 'name': 'TypeError'}

, 'request': {'method': 'GET', 'url': '/v2/workflows/instances'}, 'response': {'statusCode': 500}}

How reproducible:

100%

Steps to reproduce:

1. use openapi generated client to get /v2/workflows/instances

2. message decoding error because _a.toUTCString is not a function

Actual results:

_a.toUTCString is not a function

Expected results:{}

Message decode is successful