Mofei Zhang 25388d3fda [be] Clean up null -> PolyType in ObjectShape
--- 

Question - should the unifier ignore `PolyType` for now? 

```js 

class Unifier { 

// ... 

bindVariableTo(v: TypeVar, type: Type) { 

if (type.kind === "Poly") { 

return; 

} 

// ... 

```
2023-03-30 15:03:11 -04:00
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