Create and edit multianswer , calculated, calculatedsimple and calculatedmulti questions.
Verify that there are no "Invalid array parameter detected in required_param(): answer" Developer debug messages output at any time.
This is breakage caused by MDL-26796.
MDL-26796 stop accepting arrays in required_param() and optional_param()
MDL-30199 Tolerance should not be required for the answer * in numerical/calculated questions
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