CPDecimalAdd tested for underflow twice when reporting overflow of two negative operands, so the overflow was never swapped to underflow.
* CPDecimal: Swap CPCalculationOverflow to CPCalculationUnderflow for a negative result, matching CPDecimalSubtract.
* CPDecimalTest: Add a test that the overflow of two negative operands is reported as underflow.
Without this fix, CPDecimal will return NaN for numbers that have leading zeros, e.g., 0123.
This fix changes the matching regex to allow leading zeros to pass. This is then converted to a proper number later on, e.g., "0123" => 123. This is in line with Cocoa behaviour.
This commit also includes updated unit tests.
David Richardson
Martin Carlberg
Andrew Hankinson
Aparajita Fishman
Stephen Ierodiaconou
Aparajita Fishman
Alexander Ljungberg
Eric Wong
Alexander Ljungberg