fix(helpers): keep fullform singular for negative one-magnitude values - #337

Unexpected input(s) 'always-auth', valid inputs are ['node-version', 'node-version-file', 'architecture', 'check-latest', 'registry-url', 'scope', 'token', 'cache', 'package-manager-cache', 'cache-dependency-path', 'mirror', 'mirror-token']