inconsistant `var` result when array has only one element

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
52/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
julia
Domain
backend

Research direction

Start by reading the implementation of varmult and its tests, then compare its one-element behavior with Julia's Statistics.var([1]). The issue shows that varmult(*, [1]) returns 0.0 while var([1]) returns NaN; determine the intended behavior and add a regression test for the agreed result.

Written by the indexing model from the issue text.

Description

breaking bug 
julia> using Statistics

julia> varmult(*, [1])
0.0

julia> var([1])
NaN
Dominant language
Julia
Stars
59
Forks
24
Avg merge
13h 2m
Merged PRs (30d)
15

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