camelcase-keys doesn't support circular object

[bglimepoint]

Hello :-)

camelcase-keys currently doesn't support circular objects - is that something that you'd be open to it supporting?

A simple reproduction is:

import camelcaseKeys from 'camelcase-keys'

const x = {}
x.data = x

camelcaseKeys(x, { deep: true }) // fails with RangeError: Maximum call stack size exceeded.

We've poc'd an implementation by allowing map-obj to take the isSeen argument from external and calling it akin to bglimepoint@1d74d5c (paired with bglimepoint/map-obj@6fb5d38), but weren't sure if you'd be open to doing something akin to that :-) (Or if there might be a better way to achieve it :-) )

Thanks for your time :-)