fix the numeric truncation problem of SumAs function

[wjiec]

R(v) causes precision loss when a float array is passed and needs to return an integer.

for example: SumAs[int64]([]float64{0.1, 0.2, 0.3, 0.4})

[sonarcloud[bot]]

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[coveralls]

Pull Request Test Coverage Report for Build 3852001786

• 19 of 19 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 3099463024:	0.0%
Covered Lines:	1779
Relevant Lines:	1779

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💛 - Coveralls

[chen3feng]

Many thanks