LotusScript – Error: Type Mismatch

I ran into an issue with a Variant variable passed from one LotusScript class to another. (error: Type mismatch)

The code reads the first ( and only ) document in a database and gets the values from a multi value item.
The value of this item is stored in a Variant; a getter lets you access the values.

Class ConfigProvider

Public Class ConfigProvider
	
	Private m_settings As Variant
	
	Public Sub New
		Dim session As New NotesSession

		m_settings = _
		FullTrim(session._
		currentDatabase._
		Alldocuments._
		Getfirstdocument()._
		Getitemvalue("settings"))
		
	End Sub

	Public Property Get Settings As Variant
		Settings = m_settings
	End Property
End Class

I access the ConfigProvider from within another class in a different LotusScript library. The code is invoked by an agent

Agent

Option Public
Option Declare
Use "de.eknori.config.provider"
Use "de.eknori.config.consumer"

Sub Initialize
	Dim cc1 As New ConfigConsumer(1)
	Dim cc2 As New ConfigConsumer(2)
	Dim cc3 As New ConfigConsumer(3)
End Sub

Class ConfigConsumer

Public Class ConfigConsumer
	
	Private m_settings As Variant
	
	Public Sub New(flag As integer)
		
		Dim cp As New ConfigProvider
		m_settings = cp.Settings
		
		MsgBox ""
		MsgBox " -------- sample: " + CStr(flag) 
		
		Select Case flag
			Case 1       :  'works
				ForAll t In m_settings
					MsgBox CStr(t)
				End ForAll

			Case 2       : 'works
				Dim i As Integer
				For i = 0 To UBound(cp.Settings)
					MsgBox CStr(cp.Settings(i))
				Next

			Case 3       : 'does not work
				ForAll s In cp.Settings
					MsgBox CStr(s)
				End ForAll
				
			Case Else    : 
				msgbox "Else"
		End Select

	End Sub

End Class

The expected behaviour is that in all cases, the code would print the values from the config document to the console, but …

te amgr run "variant.nsf" 'test'
09/03/2019 07:38:25 AM  AMgr: Start executing agent 'test' in 'variant.nsf'
09/03/2019 07:38:25 AM  Agent Manager: Agent message: 
09/03/2019 07:38:25 AM  Agent Manager: Agent message:  -------- sample: 1
09/03/2019 07:38:25 AM  Agent Manager: Agent message: item1
09/03/2019 07:38:25 AM  Agent Manager: Agent message: item2
09/03/2019 07:38:25 AM  Agent Manager: Agent message: item3
09/03/2019 07:38:25 AM  Agent Manager: Agent message: 
09/03/2019 07:38:25 AM  Agent Manager: Agent message:  -------- sample: 2
09/03/2019 07:38:25 AM  Agent Manager: Agent message: item1
09/03/2019 07:38:25 AM  Agent Manager: Agent message: item2
09/03/2019 07:38:25 AM  Agent Manager: Agent message: item3
09/03/2019 07:38:25 AM  Agent Manager: Agent message: 
09/03/2019 07:38:25 AM  Agent Manager: Agent message:  -------- sample: 3
09/03/2019 07:38:25 AM  Agent Manager: Agent 'test' error: Type mismatch
09/03/2019 07:38:25 AM  AMgr: Agent 'test' in 'variant.nsf' completed execution

This is reproducible on Domino V9.x, V10.x and V11 Beta1

I have attached a small sample database, so you can test in your own environment