Marc Hassan 0b8592a35c mergeWith: stack passed to customizer should always be defined (#4244) ...

Summary:
If the first values encountered in the `object` in mergeWith are not objects, `stack` is undefined when passed to the `customizer`. Once the first object-ish value is encountered, `stack` gets initialized, and all further calls to `customizer` include a defined `stack`. This PR makes `stack` always defined, even before the first object-ish value is encountered.

2019-03-21 20:54:53 -07:00

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