JSON sort changed behaviour to case sensitive

[j-seixas]

From this change #238, the sort JSON fixed the randomization if the same key is present in different cases (lower vs upper), but introduced an ASCII sorting, meaning that changed the behaviour of sorting.

Example

{
  "ba": "something",
  "Ab": "something",
  "aa": "something",
  "Bb": "something",
}

Expected behaviour - and how it was before:

{
  "aa": "something",
  "Ab": "something",
  "ba": "something",
  "Bb": "something",
}

Current behaviour - ignores the actual ascending sort (a before b, and only sorts by ascii code)

{
  "Ab": "something",
  "Bb": "something",
  "aa": "something",
  "ba": "something"
}

Can the comparison of the ascii be made to have only if the lowercase version of the 2 letters are the same?
E.g. lowercase(a) === lowercase(b) && a !== b -> compare it by ascii, if not do the same as it was