No need to assign a variable using a ternary.

We only use it once, and booleans in numeric
context do the same thing as the ternary did
anyway.

This is faster than iterating over keys and
then getting the values.

Needed for for_list feature

A small speedup that will be useful under randomisations

`use experimental` instead of the two step
`use feature; no warnings` idiom

more CI stuff

Appveyor: enable BD tests
GH: cleanup commented code

GH CI windows cache

more appveyoring

GH CI: quieter windows

more appveyor shenanigans

GH CI windows: cache ./local

shogo82148/actions-setup-perl sends modules there,
overriding the env settings

CI appveyor full build again

CI appveyor partial build to trigger cache

CI probing

GH CI: windows use strawberry

GH CI: use shogo82148/actions-setup-perl on windows

GH CI: use perl 5.40 on windows

GH CI: refresh windows cache

GH CI: cache and checkout actions to v4

CI: appveyor to perl 5.38

It seems not to be stable on some systems.

Even the "no faster::Maths" triggers checks
for it being installed.

Simplify the setup in the process.
(Tested and debugged on a separate branch).