Since you describe the "docs" as "not easy", I am concerned that you are only looking at docs.perl6.org and not also looking at the tutorial level information at perl6.org/resources. Have you looked at tutorials or introductory books?
A review of the tutorials led me to refine:
for @arr {
say ( .map: {.fmt: "%7.1f\t"} ).join
}
to be
for @arr {
say ($_>>.fmt: "%7.1f\t" ).join
}
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