#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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