in aws-mwaa-environment/src/main/java/software/amazon/mwaa/translator/TypeTranslator.java [45:53]
public static Map<String, String> toStringToStringMap(final Map<String, Object> input) {
if (input == null) {
return null;
}
Map<String, String> result = new HashMap<>();
input.forEach((key, value) -> result.put(key, value == null ? null : value.toString()));
return result;
}