Jush Jiang

Please support allow_false feature

1

## Checklist - [x] I have searched the [issue list](https://github.com/osteele/liquid/issues) - [ ] I have tested my example against Shopify Liquid. (This isn't necessary if the actual behavior is a...

### Proposal Wiremock version: 3.9.2 ~ 3.12.1 (3.9.1 works fine) Wiremock returns a 500 `Duplicate key null` error when calling the API from python codes with "\r\n" in the request...