Statistcs.cov has type stability issues

[joa-quim]

At least that's how I interpret the JET report

using JET
using Statistics

@report_opt cov(rand(10,3))
═════ 32 possible errors found ═════
┌ cov(X::Matrix{Float64}) @ Statistics C:\workdir\usr\share\julia\stdlib\v1.9\Statistics\src\Statistics.jl:584
│┌ cov(X::Matrix{Float64}; dims::Int64, corrected::Bool) @ Statistics C:\workdir\usr\share\julia\stdlib\v1.9\Statistics\src\Statistics.jl:584
││┌ kwcall(::NamedTuple{(:corrected,), Tuple{Bool}}, ::typeof(Statistics.covm), x::Matrix{Float64}, xmean::Matrix{Float64}, vardim::Int64) @ Statistics C:\workdir\usr\share\julia\stdlib\v1.9\Statistics\src\Statistics.jl:561
│││┌ covm(x::Matrix{Float64}, xmean::Matrix{Float64}, vardim::Int64; corrected::Bool) @ Statistics C:\workdir\usr\share\julia\stdlib\v1.9\Statistics\src\Statistics.jl:561
...

With 1.10b3

@report_opt cov(rand(10,3))
═════ 190 possible errors found ═════
┌ cov(X::Matrix{Float64}) @ Statistics C:\programs\Julia-1.10\share\julia\stdlib\v1.10\Statistics\src\Statistics.jl:594
│┌ cov(X::Matrix{Float64}; dims::Int64, corrected::Bool) @ Statistics C:\programs\Julia-1.10\share\julia\stdlib\v1.10\Statistics\src\Statistics.jl:594
││┌ kwcall(::@NamedTuple{corrected::Bool}, ::typeof(Statistics.covm), x::Matrix{Float64}, xmean::Matrix{Float64}, vardim::Int64) @ Statistics C:\programs\Julia-1.10\share\julia\stdlib\v1.10\Statistics\src\Statistics.jl:571
│││┌ covm(x::Matrix{Float64}, xmean::Matrix{Fl

[nalimilan]

I'm not familiar with @report_opt, but looking at the output it seems it reports instabilities which are in functions not living in Statistics.jl, and probably not problematic (e.g. error printing). Please reopen if you have evidence that this creates problems.