mochajs / mocha / 3811

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fix inaccurate diff output due to post-assertion object mutation  (#3075)

* have Base generate the strings for error messages immediately instead of delaying until epilogue, the reason for this is that it is possible to reference objects in errors that could be mutated after the error occurs, causing the printed error message to be misleading

* re-add stringify during list to appease tests, open for discussion if this is correct behavior

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