Explicitly entering a negative number will cause an (infinite?) hang when backspace is clicked. For example, if the number -369 is entered (3, 6, 9, +/-), then the 6 and 9 are correctly removed by backspace, but the final -3 will cause the hang. Decimal points are also correctly removed - so it seems the problem is related to the number of characters rather than the actual value of the number.
If the number is the product of a sum (eg. 2 - 5), then the backspace correctly turns the -3 into zero.
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