Subtle bug

> This program has a subtle bug. Open issue if you found it and I'll give you credit.

Since object keys are strings, anything that's not a string will be stringified, which will make the following true:

```
1 === '1'
{} === {}
[] === []
//...
```

The issue does not name a file, test, or entry point. Start by inspecting the repository's program and reproducing the object-key behavior described in the issue; done means identifying the specific bug, documenting the expected behavior, and adding a focused fix or test if the repository supports one.

Written by the indexing model from the issue text.