I had to explicitly include a count in template: "(QX$pad_len)$count", instead of simply "(QX$pad_len)*", because otherwise @values array would result in a very puzzling length of 2501 items instead of 1000 i.e. $count.
I suspect there's special code somewhere to prevent ((un?)documented(?) case of) endless loops with '(CX)*' or '(vX2)*' or similar, but still:
say for unpack '(VX2)*', "\1\1\1\1"; # why 2 items?
say for unpack '(VX3)*', "\1\1\1\1";
'X' outside of string in unpack # how's that?
and why 2501 items with '(QX3)*' template to begin with?
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