v3; defaults to pkgx^2; pure js rewrite #78

Job	Run time
eval-bash	13s
eval-zsh	27s
eval-posix-sh	12s
install-pkgx (macos-latest)	5s
sudo-not-required	13s
usage-as-proxy	22s
install-pkgx (ubuntu-latest)	12s
linuxen (debian:buster-slim)	20s
multiple-apply-is-ok	14s
linuxen (debian:bullseye-slim)	21s
linuxen (debian:bookworm-slim)	24s
sudo-required	13s
linuxen (archlinux:latest)	26s
no-dirs (/usr/local)	14s
linuxen (ubuntu:focal)	20s
no-dirs (/usr/local/bin)	14s
linuxen (ubuntu:jammy)	21s
upgrades	20s
linuxen (ubuntu:lunar)	8s
linuxen (fedora:latest)	20s
	5m 39s

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