Matrix view based on BitVector?

[mbauman]

See:

Shouldn't `@views sum(data[mask])` be non-allocating?

I was surprised to see the following function allocates - is this expected? using BenchmarkTools function f_viewalloc(data, mask) @views sum(data[mask]) end let N = 1_000_000 data = fill(true, N) mask = fill(true, N) @btime f_viewalloc($data, $mask) end 1.476 ms (2 allocations: 7.63 MiB)