Validation Rules do not work for some special values (false, 0, null, ...)

[Beutlin]

Describe the bug
After the request the validation of json data is in some cases wrong.

To Reproduce

1. Call some page which returns this simple JSON:
   { a: false, b: 0, c: null }

2. Validate a, b, c in your config with:
   {jsonpath: content.a, expect: false, jsonpath: content.b, expect: 0, jsonpath: content.c, expect: null }

3. Result:
   Schema Validation failed: ""expect" must be a boolean"

Expected behavior
No errors, as the returned value and the expected value are the same.

Additional context
Have a look at https://dorey.github.io/JavaScript-Equality-Table/.
Here are some corner cases which value of variables might be compared to the corresponded value.

[Beutlin]

Oh, I've just seen that this issue is already fixed on the master branch.
Maybe you can update the version of your software, thus that users who install strest with npm also benefit from it.