Make comparisons/sort-by more 'global' (#4500)

* Make comparisons/sort-by more 'global'

* Let custom values do their own comparisons

crates/nu-command/tests/commands/sort_by.rs

@@ -146,3 +146,16 @@ fn ls_sort_by_type_name_insensitive() {
     let json_output = r#"[{"name": "C","type": "Dir"},{"name": "a.txt","type": "File"},{"name": "B.txt","type": "File"}]"#;
     assert_eq!(actual.out, json_output);
 }
+
+#[test]
+fn sort_different_types() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            [a, 1, b, 2, c, 3, [4, 5, 6], d, 4, [1, 2, 3]] | sort-by | to json --raw
+        "#
+    ));
+
+    let json_output = r#"[1,2,3,4,"a","b","c","d",[1,2,3],[4,5,6]]"#;
+    assert_eq!(actual.out, json_output);
+}