Fix isPlainObject (#3197)
#3198
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Fixes #3197
isPlainObjectcompares stringified proto constructor withObjectconstructor, however we did not make sure that theconstructoris actually own property of the prototype. Therefore in cases where constructor was not defined, likeObject.create({}), we were comparing constructor inherited fromObject, leading to false positive.lodash impl for reference:
https://github.com/lodash/lodash/blob/4.17.15/lodash.js#L12036