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.4  .6  .1
.3  .5  .1
.0  .2  .1
.5  .7  .1

my @keys = qw(start stop step);
for my $type (@keys) {
  print $point->{$type}, "\t";
}

my @keys = qw(start stop step);
for my $type (@keys) {
  next unless exists $point->{$type};
  print $point->{$type}, "\t";
}

my %weights = ( start => 10, stop => 20, step => 30 );
for my $type ( sort { $weights{$a} <=> $weights{$b} } keys %$point ) {
  print $point->{$type}, "\t";
}

my %weights = do { my $i = 0; map { $_ => $i++ } qw(start stop step ot
+her stuff in order here) };