... It is interpolated, so any vars inside the HEREDOC is also expanded

it doesn't have to be interpolated, see the following... 

print <<'END';
$foo was here
and here
END

# will print
$foo was here
and here

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---
my name's not Keith, and I'm not reasonable.

In reply to Re^2: assign a string using multiline format by reasonablekeith
in thread assign a string using multiline format by danmcb

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