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rc/sh/arith

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#!/usr/bin/env zsh
# YES_ZSH
# YES_BASH
# YES_DASH
# though technically compatible with other shells,
# extra functionality is through zsh's extended arithmetic functions.
arith() {
# <<<"$(($@))"
printf "%s\n" "$(($@))"
}
[ "${SOURCING:-0}" -gt 0 ] || arith "$@"