my %F =   (a=>1, b=>2, c=>3);
my @F = qw(a 1 b 2 c 3);
foo(%F);
foo(@F);

##</code><code>##

#New simpler code to avoid slices
my %F =   (a=>1);
my @F = qw(a 1);
foo(%F);
foo(@F);