Possibly warn about recursive objects

[nullivex]

If a recursive object is accidentally passed to this function it will result in the dreaded maximum call stack exceeded error with virtually no debug information.

I have written the following package: https://github.com/snailjs/object-manage that utilizes this tool for merges after testing a few different solutions.

I ended up implemented a depth warning that prints a stack trace before merging a deep object. I dont think its the perfect solution but it at least gives a stack trace that can be used to figure out where the bad object is coming from.

I am wondering if this is something that could be supported here rather than downstream in my package.

I would be will to submit a pull request if there is any interest in this.

Thanks