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Ran 11 Mar 2024 11:19AM UTC

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Committed 11 Mar 2024 06:50AM UTC coverage: 86.653% (-0.01%) from 86.665%

Job # #37712.1

Build Type

push

local

Committed by

web-flow

Commit Message

LinAlg: fzeropreserving unit triangular broadcast preserves structure (#53648)

On master
```julia
julia> UU = UnitUpperTriangular(reshape([1:9;],3,3))
3×3 UnitUpperTriangular{Int64, Matrix{Int64}}:
 1  4  7
 ⋅  1  8
 ⋅  ⋅  1

julia> UU .* 2
3×3 Matrix{Int64}:
 2  8  14
 0  2  16
 0  0   2
```
This PR
```julia
julia> UU .* 2
3×3 UpperTriangular{Int64, Matrix{Int64}}:
 2  8  14
 ⋅  2  16
 ⋅  ⋅   2
```
This also improves performance, as the `materialize` skips the
structured zeros.
```julia
julia> UU = UnitUpperTriangular(rand(100, 100));

julia> @btime $UU .* 2;
  12.788 μs (3 allocations: 78.20 KiB) # master
  7.821 μs (3 allocations: 78.20 KiB) # PR
```

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