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kevinveenbirkenbachandClaude Opus 5
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join(' ') renders KEY=a b, which the shell reads as KEY=a prefixed to the
command b: the variable is set for that command only and unset afterwards,
so the consumer's ': "${…?}"' guard kills the run over a value the
rendered file plainly shows.
dotenv_quote does not fix it. docker stack deploy passes the value verbatim
in swarm mode, so the quotes would land inside it.
Both sides move to a comma, which the shell does not split on.
The four existing cases could not have caught this: each passes a single
name or an empty string, and one element renders the same either way. The
added case is the only one that sees the separator, and removing IFS makes
it fail.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>