Boolean field marked as object by the plugin

[darioielardi]

I'm submitting a...

[ ] Regression 
[ x ] Bug report
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

In some situations a boolean field in a DTO class is annotated as an object by the swagger plugin in the API schema. I didn't manage to identify the exacts circumstances where this happens, it probably only occurs when the field is marked as optional ( annotated with a ? ), and it probably never occurs when the field is marked with the ApiPropertyOptional decorator.
This has been already posted by another user in the Nest repo ( nestjs/nest#4913 ) and by me in the Discord channel.

Minimal reproduction of the problem with instructions

I didn't manage to reproduce the bug in a brand new Nest app, but I published the sample project I was working on the last time I faced the bug: https://github.com/darioielardi/nest-swagger-boolean-bug

The DTO class for which the bug occurs is the PaginationDto class in the src/common/common.dto.ts file. The field count has type boolean but when I start the server ( with Nest CLI, swagger plugin enabled ) and look at the generated swagger schema it is marked as an object.

Environment

Nest version: 7.0.0
 
For Tooling issues:
- Node version: v12.13.1
- Platform:  Mac

[kamilmysliwiec]

Fixed in 4.5.11. Thanks for reporting! Let me know if you have any further issues