Types of Changes

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• I have read the CONTRIBUTING document
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• Bug fix (non-breaking change which fixes an issue, please reference the issue id)
• New feature (non-breaking change which adds functionality, make sure to open an associated issue first)
• Breaking change (fix or feature that would cause existing functionality to change)
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• I have added tests to cover my changes
• All new and existing tests passed

Description

Fixes #104.

When IN operator is used to search for property in an object and that object doesn't have the property, but has string indexer, then the indexer is used to look for property. Before fix, even if indexer returned null, i.e. "doesn't exist", IN returned true.

A few additional tests for IN operator were added as well, just to be sure if this change didn't break anything.