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Joe Savona
76c44abfbe
Adds fixture tests to demonstrate an issue in changing PropertyStore to always have a Store effect on its object operand, regardless of the operand type. The issue is that if we're doing a PropertyStore on a nested value, that has be considered a transitive mutation of the parent object:
```
const x = {y: {z: {}}};
x.y.z.key = 'value'; // this has to be a mutation of `x`
```
Fix in the next PR.
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