This is documented in perlsyn:
The while and until modifiers have the usual "while loop"
semantics (conditional evaluated first), except when applied
to a do-BLOCK (or to the deprecated do-SUBROUTINE
statement), in which case the block executes once before
the conditional is evaluated. This is so that you can
write loops like:
do {
$line = <STDIN>;
...
} until $line eq ".\n";
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