Incorrect request generated from formData with collectionFormat=multi

[tim-lai]

Q&A (please complete the following information)

Reference swagger-api/swagger-ui#3838

Content & configuration

Reference swagger-api/swagger-ui#3838

Describe the bug you're encountering

Referencing swagger-api/swagger-ui#3838
There are two separate issues when using Try It Out -> Execute

1. SwaggerUI generates incorrect cURL for display. This is a SwaggerUI specific issue.
2. SwaggerClient generates incorrect request to send. This is a SwaggerClient specific issue (this issue).

To reproduce...

Reference swagger-api/swagger-ui#3838

Expected behavior

SwaggerClient should return a proper FormData instance supporting multiple same keys

Note, OAS 2 and OAS 3.0 have different implementations

Screenshots

Additional context or thoughts