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e.g.
```ruby
{ 1 => 2 }
```
The callback will be invoked for `1` as while it has a native JSON
equivalent, it's not legal as an object name.
e.g.
```ruby
{ 1 => 2 }
```
The callback will be invoked for `1` as while it has a native JSON
equivalent, it's not legal as an object name.