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  1. or download this
    has arg => qw(is rw isa ArrayRef), default => sub { [] }; # untidy
  2. or download this
    has
arg => qw(is rw isa ArrayRef),
default => sub { [] }; # nooooooo
  3. or download this
    has arg => qw(is rw isa ArrayRef),
   default => sub { [] }; 
...
# much better, although I don't mind the indentation
# the crucial thing is the "has arg" part