v3; defaults to pkgx^2; pure js rewrite #116

Job	Run time
usage-as-proxy	26s
sudo-not-required	15s
sudo-required	12s
install-pkgx (macos-latest)	6s
install-pkgx (ubuntu-latest)	15s
linuxen (debian:buster-slim)	18s
multiple-apply-is-ok	27s
linuxen (debian:bullseye-slim)	27s
no-dirs (/usr/local)	17s
upgrades	45s
linuxen (debian:bookworm-slim)	19s
no-dirs (/usr/local/bin)	18s
linuxen (archlinux:latest)	19s
linuxen (ubuntu:focal)	22s
linuxen (ubuntu:jammy)	20s
linuxen (ubuntu:noble)	20s
linuxen (fedora:latest)	36s
	6m 2s

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