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This PR introduces a new exported function in the multierr package called `Every`, which checks every error within a given error against a given target using `errors.Is`, and only returns true if all checks return true. ```go err := multierr.Combine(ErrIgnorable, errors.New("great sadness")) fmt.Println(errors.Is(err, ErrIgnorable)) // output = "true" fmt.Println(multierr.Every(err, ErrIgnorable)) // output = "false" err := multierr.Combine(ErrIgnorable, ErrIgnorable) fmt.Println(errors.Is(err, ErrIgnorable)) // output = "true" fmt.Println(multierr.Every(err, ErrIgnorable)) // output = "true" ``` This also works when the error passed in as the first argument is not a `multiErr`, including when it is a go1.20+ error that implements `Unwrap() []error`. This solves #66.
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