ScopedValue: Capturing current bindings

[Daniel Avery]

Would it not be sufficient to use a local variable to capture the current
binding?

```
ScopedValue<String> testValue = ScopedValue.newInstance();

ScopedValue.where(testValue, "OuterValue", () -> {
  String value = testValue.get();
  withBinding(String.class, () -> value, () -> {
    ScopedValue.where(testValue, "InnerValue", () -> {
      System.out.println(getByType(String.class));
    });
  });
});
```

- Daniel
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