Map with Multi worded or single worded with symbols keys from List does not work

[BaccanoMob]

Using example from README.md

{
  "niceList": [
    "hello",
    "nice",
    [
      "first item in nested list",
      "second item in nested list"
    ],
    {
      "wow": "WOW!",
      "ok": "OK!"
    },
    {
      "a map entry": "access via key",
      "another entry": "access via second key"
    }
  ]
}

when dart run slang is run to generate translations I get

// **THIS WORKS AS INTENDED**
class Translations$niceList$0i4$$niceList$0i3$EnIn {
	Translations$niceList$0i4$$niceList$0i3$EnIn.internal(this._root);

	final Translations _root; // ignore: unused_field

	// Translations
	String get wow => 'WOW!';
	String get ok => 'OK!';
}

// THIS IS GENERATAED AS THE SAME AS SINGLE WORD
class Translations$niceList$0i4$$niceList$0i4$EnIn {
	Translations$niceList$0i4$$niceList$0i4$EnIn.internal(this._root);

	final Translations _root; // ignore: unused_field

	// Translations
	String get a map entry => 'access via key'; // ERROR
	String get another entry => 'access via second key'; // ERROR
}

With symbols, "ok!!": "OK!" also generates String get ok!! => 'OK!'; and causes error.

When used with (map), works well

 "a(map)":{
      "a map entry1": "access via key",
      "another entry1": "access via second key",
      "ok!!": "OK!"
    }

Manual Fix:
uncomment all errors and its classes and add map manually. (works for simple cases and needs to be done again when code is generated afterwards)

        Translations$niceList$0i3$EnIn.internal(_root),
        // Translations$niceList$0i4$EnIn.internal(_root), 
        {
          "a map entry": "access via key",
          "another entry": "access via second key"
        }

Recommend to change the README.md with working examples.

[BaccanoMob]

Just found that below in slang.yaml fixes it (and prolly something similar for build.yaml as well) rather than the manual fix.

maps:
  - niceList.4

The values are from // Path: niceList.4 line above the functions with errors.