gistfile1.txt

concat {'/tmp/junk.txt':
  ensure =>  present,
}

$a = [1, 3, 5, 7, 9]
$b = [2, 4, 6, 8, 10]

$a.each |$value| {
  concat::fragment {"odds-${value}":
    target  => '/tmp/junk.txt',
    content => "$value \n",
    order   => numeric
  }
}

$b.each |$value| {
  concat::fragment {"evens-${value}":
    target  => '/tmp/junk.txt',
    content => "$value \n",
    order   => numeric,
  }
}

Resultant file /tmp/junk:

10
2
4
6
8
1
3
5
7
9

Desired output:

1
2
3
4
5
6
7
8
9
10

Changing the order paremeter has no affect:

concat {'/tmp/junk.txt':
  ensure =>  present,
}

$a = [1, 3, 5, 7, 9]
$b = [2, 4, 6, 8, 10]

$a.each |$value| {
  concat::fragment {"odds-${value}":
    target  => '/tmp/junk.txt',
    content => "$value \n",
    order   => '10',
  }
}

$b.each |$value| {
  concat::fragment {"evens-${value}":
    target  => '/tmp/junk.txt',
    content => "$value \n",
    order   => '10',
  }
}