v3; defaults to pkgx^2; pure js rewrite #108

Job	Run time
usage-as-proxy	23s
install-pkgx (macos-latest)	6s
install-pkgx (ubuntu-latest)	12s
eval-bash	11s
eval-zsh	23s
eval-posix-sh	13s
multiple-apply-is-ok	15s
linuxen (debian:buster-slim)	18s
no-dirs (/usr/local)	17s
sudo-not-required	16s
sudo-required	12s
no-dirs (/usr/local/bin)	17s
linuxen (debian:bullseye-slim)	11s
linuxen (debian:bookworm-slim)	19s
upgrades	15s
linuxen (archlinux:latest)	21s
linuxen (ubuntu:focal)	19s
linuxen (ubuntu:jammy)	21s
linuxen (ubuntu:24.04)	25s
linuxen (ubuntu:24.10)	20s
linuxen (fedora:latest)	20s
	5m 54s

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