Specify behavior of statistical reductions over the empty set #262
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This PR
specifies the behavior of statistical reductions when the number of elements over which to compute a reduction is zero and resolves gh-232.
Notably, this PR proposes
max: implementation-defined (due to no consistent maximum value across all supported data types).mean: returnNaN.min: implementation-defined (due to no consistent minimum value across all supported data types).prod: return1(empty product).std: returnNaN.sum: return0(empty sum).var: returnNaN.