Supported list types
Number list
This function combines two number lists.
append(list1, list2) #Output: Number list
Text list
This function returns a text list with all strings in arguments l and m. The duplicated strings may appear in the output
append(string list l, string list m) #Output: Text list
Issue list
This function returns an issue list with all issues in arguments l and m. Duplicated issues may appear in output.
union(issue list l, issue list m) #Output: Issue list