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Return the sum of an array of integers
Source position: math.pp line 403
| function sumInt( | 
| const data: PInt64; | 
| const N: LongInt | 
| ):Int64; | 
| const data: array of Int64 | 
| ):Int64; | 
SumInt returns the sum of the N integers in the Data array, where this can be an open array or a pointer to an array.
An overflow may occur.