overwriteWithEmptyValue is forced to true when merging an object involving maps

[liggitt]

#85 introduced a bug that can leave overwriteWithEmptyValue set to true if a map is encountered, but one of the continue or return statements is called before calling deepMerge (which reset to false)

https://github.com/imdario/mergo/blob/29fb3d3bdc5512887f1dc9aedde6a0fed407fa8f/map.go#L72-L100

#133 made the bug worse by removing the reset to false in deepMerge, so now, any merge involving a map leaves overwriteWithEmptyValue set to true for all remaining merges.

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[darccio]

@liggitt I regret I'm unable to fix this in a quick way. Can you provide a PR?

[darccio]

Fixing this in v2.

[haircommander]

hey @darccio I am curious about v2 timeline. I believe we're hitting this issue in kubernetes/kubernetes#121193 and it's not clear to me how to work around this behavior.

[darccio]

@haircommander There is no planned timeline. I work on Mergo in my spare time. I will appreciate any help on this.