When arrays are turned into JSON, they are represented as objects where the keys are numbers, e.g.

x {
foo = [ "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k" ]
}

is equivalent to

x { foo {
"0": "a"
"1": "b"
"2": "c"
"3": "d"
"4": "e"
"5": "f"
"6": "g"
"7": "h"
"8": "i"
"9": "j"
"10": "k"
} }

Unfortunately, when rendered this will appear as:

x { foo {
"0": "a"
"1": "b"
"10": "k"
"2": "c"
"3": "d"
"4": "e"
"5": "f"
"6": "g"
"7": "h"
"8": "i"
"9": "j"
} }

The keys are sorted using the default sort. They should be sorted using an alphanumerical comparator.