Oh, then chain join on the end:
my $StringReversedLines = $StringFullOfLineFeeds.lines.reverse.join("\n")
or
my $StringReversedLines = $StringFullOfLineFeeds.split("\n",:v).reverse.join
Oh, then chain join on the end:
my $StringReversedLines = $StringFullOfLineFeeds.lines.reverse.join("\n")
or
my $StringReversedLines = $StringFullOfLineFeeds.split("\n",:v).reverse.join