`validateType` fails on "empty object": `{}` vs `Object.create(null)`

[kungfooman]

I'm running into an issue in transformers.js with validateType, because there are multiple ways to make an "object":

const value = Object.create(null);
validateType(value, {type: 'object', optional: true}, "loc", "name", true);

So far I can't find a good way to represent Object.create(null) as type... but replacing value instanceof Object with typeof value === 'object' should work anyway.

I also need to add some tests for this.

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