Required Integer parameter which can be 0 gets rendered as "null" by request from developer-portal

Hello,

I am working with apigee edge and have a problem with the integrated developer portal and the "Try this API" function.

There is a request parameter, which is required and can be 0, but if I enter it as such, it gets treated as null and is omitted from the request by the developer portal to the proxy. 

It feels like I am missing something very obvious, but can not figure out what.

Cheers 

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