The form over substance distinction in penalty doctrine — whereby a provision stipulating a higher interest rate with a reduction for punctual payment does not attract the penalty jurisdiction, unlike a provision stipulating a lower rate with an increase for default — remains a formidable obstacle to challenge, though it is arguable at appellate level that the rule should be reconsidered. On stay applications in mortgage possession cases, the erosion of a mortgagee's security through accruing interest during the stay period is a significant factor weighing against a stay where the mortgagor cannot offer security to protect against that erosion.
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