--- Comment #28 from ---
What I was doing wrong was that the rule for subshells actually is "removing
sequences of one or more <newline>s at the end of the substitution."

And that is in effect for heritage and posix. So we can't use that as feature
detection :-(

Switching to bash I do not think works for AIX, which does not include bash by

I am still thinking that testing with uname for Solaris 10 and just not
protecting trailing NLs in that case may be the best we can do.

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