Zero ticks are missing

[maxfreu]

using CairoMakie
fig = Figure(size = mm2pt.((83, 50)))
ax = Axis(fig[1, 1])
r = rand(20,30)
colsize!(fig.layout, 1, Aspect(1, size(r)[1] / size(r)[2]))
heatmap!(ax, r; colorrange = (0, 1))
save("deleteme.pdf", fig)

I would expect to see zero ticks in this image. They are also missing for a simple call to heatmap.
Makie 0.20.7, CairoMakie 0.11.8, julia 1.10

[jkrumbiegel]

the heatmap cells start counting at 1 and are centered with a width of 1. So the limits start at 0.5, that's why you don't have a zero :)

[maxfreu]

Ahh yes, counting would have helped, thanks! Then the only thing is that the outermost pixels are a bit too small, because they are overlapped by the axes. But that's a minor issue and a different one...