These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] app-arch/csnappy-0_pre20220804:0/0_pre20220804::gentoo  582 KiB
[ebuild  N     ] dev-libs/miniz-3.1.2:0/3.1.2::gentoo  284 KiB
[ebuild  N     ] dev-perl/Sereal-Encoder-5.6.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 874 KiB
[ebuild  N     ] dev-perl/Sereal-Decoder-5.6.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 876 KiB
[ebuild  N     ] dev-perl/MCE-1.902.0::gentoo  USE="sereal -test" PERL_FEATURES="ithreads (-debug) -quadmath" 229 KiB

Total: 5 packages (5 new), Size of downloads: 2842 KiB