An 8192x1 source at 1x8192, or the same turned on its side, has a centre
with the requested proportions 1/8192 of a pixel wide. The crop must keep
at least one pixel of it, or the request fails. The test's cases are now
named by source and requested size.
Model: opus-5-5
An 8192x64 or 8192x1 source, or one turned on its side, requested at
8192x8192 with fit=cover must be served at that size, and fit=cover must
keep the centre of an ordinary source.
Model: opus-5-5
sneak