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

* Make comparisons/sort-by more 'global'

* Let custom values do their own comparisons

crates/nu-command/src/dataframe/eager/drop_duplicates.rs

@@ -39,11 +39,11 @@ impl Command for DropDuplicates {
                 NuDataFrame::try_from_columns(vec![
                     Column::new(
                         "a".to_string(),
-                        vec![Value::test_int(1), Value::test_int(3)],
+                        vec![Value::test_int(3), Value::test_int(1)],
                     ),
                     Column::new(
                         "b".to_string(),
-                        vec![Value::test_int(2), Value::test_int(4)],
+                        vec![Value::test_int(4), Value::test_int(2)],
                     ),
                 ])
                 .expect("simple df for test should not fail")

crates/nu-command/src/dataframe/eager/mod.rs

@@ -82,6 +82,7 @@ pub fn add_eager_decls(working_set: &mut StateWorkingSet) {
         DataTypes,
         DescribeDF,
         DropDF,
+        DropDuplicates,
         DropNulls,
         Dummies,
         FilterWith,

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);
+}