Trigger validation on Pop of array-of-objects

[fenech]

Make a copy of the original array, so that validation happens the same as when calling Remove on the last element.

Test case: https://codesandbox.io/s/formik-fieldarray-change-validation-bug-forked-fddidy?file=/index.js note that after adding an element, clicking on "pop" doesn't clear the error, whereas clicking on its "x" button does.

This issue affects arrays of objects in the schema. Returning a copy of the old array, instead of the original, means that validation is triggered and the errors object is correctly updated.

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[quantizor]

Fixed in recent releases