diff --git a/dist/much-select-elm-debug.js b/dist/much-select-elm-debug.js
index 4a3359c..460629d 100644
--- a/dist/much-select-elm-debug.js
+++ b/dist/much-select-elm-debug.js
@@ -13121,8 +13121,8 @@ var $author$project$Ports$valuesDecoder = $elm$json$Json$Decode$oneOf(
 			$elm$json$Json$Decode$list($elm$json$Json$Decode$string),
 			A2($elm$json$Json$Decode$map, $elm$core$List$singleton, $elm$json$Json$Decode$string)
 		]));
-var $author$project$SelectedValueEncoding$stringToValueStrings = F2(
-	function (selectedValueEncoding, valuesString) {
+var $author$project$SelectedValueEncoding$stringToValueStrings = F3(
+	function (config, selectedValueEncoding, valuesString) {
 		if ((valuesString === '') && _Utils_eq(selectedValueEncoding, $author$project$SelectedValueEncoding$CommaSeperated)) {
 			return $elm$core$Result$Ok(_List_Nil);
 		} else {
@@ -13130,8 +13130,14 @@ var $author$project$SelectedValueEncoding$stringToValueStrings = F2(
 				return $elm$core$Result$Ok(_List_Nil);
 			} else {
 				if (selectedValueEncoding.$ === 'CommaSeperated') {
-					return $elm$core$Result$Ok(
-						A2($elm$core$String$split, ',', valuesString));
+					if (config.$ === 'SingleSelectConfig') {
+						return $elm$core$Result$Ok(
+							_List_fromArray(
+								[valuesString]));
+					} else {
+						return $elm$core$Result$Ok(
+							A2($elm$core$String$split, ',', valuesString));
+					}
 				} else {
 					return A2(
 						$elm$core$Result$andThen,
@@ -13275,7 +13281,7 @@ var $author$project$MuchSelect$init = function (flags) {
 	var selectionConfig = _v10.a;
 	var selectionConfigErrorEffect = _v10.b;
 	var _v12 = function () {
-		var _v13 = A2($author$project$SelectedValueEncoding$stringToValueStrings, selectedValueEncoding, flags.selectedValue);
+		var _v13 = A3($author$project$SelectedValueEncoding$stringToValueStrings, selectionConfig, selectedValueEncoding, flags.selectedValue);
 		if (_v13.$ === 'Ok') {
 			var values = _v13.a;
 			return _Utils_Tuple2(values, $author$project$MuchSelect$NoEffect);
@@ -19460,7 +19466,7 @@ var $author$project$MuchSelect$update = F2(
 								}),
 							$author$project$MuchSelect$NoEffect);
 					case 'selected-value':
-						var _v43 = A2($author$project$SelectedValueEncoding$stringToValueStrings, model.selectedValueEncoding, newAttributeValue);
+						var _v43 = A3($author$project$SelectedValueEncoding$stringToValueStrings, model.selectionConfig, model.selectedValueEncoding, newAttributeValue);
 						if (_v43.$ === 'Ok') {
 							var selectedValueStrings = _v43.a;
 							if (A2($author$project$OptionList$selectedOptionValuesAreEqual, selectedValueStrings, model.options)) {
diff --git a/dist/much-select-elm.js b/dist/much-select-elm.js
index 6ead224..5f78cdc 100644
--- a/dist/much-select-elm.js
+++ b/dist/much-select-elm.js
@@ -7763,8 +7763,8 @@ var $author$project$Ports$valuesDecoder = $elm$json$Json$Decode$oneOf(
 			$elm$json$Json$Decode$list($elm$json$Json$Decode$string),
 			A2($elm$json$Json$Decode$map, $elm$core$List$singleton, $elm$json$Json$Decode$string)
 		]));
-var $author$project$SelectedValueEncoding$stringToValueStrings = F2(
-	function (selectedValueEncoding, valuesString) {
+var $author$project$SelectedValueEncoding$stringToValueStrings = F3(
+	function (config, selectedValueEncoding, valuesString) {
 		if ((valuesString === '') && (!selectedValueEncoding)) {
 			return $elm$core$Result$Ok(_List_Nil);
 		} else {
@@ -7772,8 +7772,14 @@ var $author$project$SelectedValueEncoding$stringToValueStrings = F2(
 				return $elm$core$Result$Ok(_List_Nil);
 			} else {
 				if (!selectedValueEncoding) {
-					return $elm$core$Result$Ok(
-						A2($elm$core$String$split, ',', valuesString));
+					if (!config.$) {
+						return $elm$core$Result$Ok(
+							_List_fromArray(
+								[valuesString]));
+					} else {
+						return $elm$core$Result$Ok(
+							A2($elm$core$String$split, ',', valuesString));
+					}
 				} else {
 					return A2(
 						$elm$core$Result$andThen,
@@ -7917,7 +7923,7 @@ var $author$project$MuchSelect$init = function (flags) {
 	var selectionConfig = _v10.a;
 	var selectionConfigErrorEffect = _v10.b;
 	var _v12 = function () {
-		var _v13 = A2($author$project$SelectedValueEncoding$stringToValueStrings, selectedValueEncoding, flags.bE);
+		var _v13 = A3($author$project$SelectedValueEncoding$stringToValueStrings, selectionConfig, selectedValueEncoding, flags.bE);
 		if (!_v13.$) {
 			var values = _v13.a;
 			return _Utils_Tuple2(values, $author$project$MuchSelect$NoEffect);
@@ -14156,7 +14162,7 @@ var $author$project$MuchSelect$update = F2(
 								}),
 							$author$project$MuchSelect$NoEffect);
 					case 'selected-value':
-						var _v43 = A2($author$project$SelectedValueEncoding$stringToValueStrings, model.h, newAttributeValue);
+						var _v43 = A3($author$project$SelectedValueEncoding$stringToValueStrings, model.a, model.h, newAttributeValue);
 						if (!_v43.$) {
 							var selectedValueStrings = _v43.a;
 							if (A2($author$project$OptionList$selectedOptionValuesAreEqual, selectedValueStrings, model.b)) {
diff --git a/package-lock.json b/package-lock.json
index d57fc31..07fa9c2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@getdrip/much-select-elm",
-  "version": "0.18.2",
+  "version": "0.18.3",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@getdrip/much-select-elm",
-      "version": "0.18.2",
+      "version": "0.18.3",
       "license": "MIT",
       "devDependencies": {
         "@esm-bundle/chai": "^4.3.4-fix.0",
diff --git a/package.json b/package.json
index 82c157c..4a9ea66 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@getdrip/much-select-elm",
-  "version": "0.18.2",
+  "version": "0.18.3",
   "description": "A fancy selector web component written (mostly) in elm.",
   "type": "module",
   "module": "dist/much-select.js",
diff --git a/run-pty.json b/run-pty.json
index 63576c6..5f22c54 100644
--- a/run-pty.json
+++ b/run-pty.json
@@ -3,6 +3,8 @@
     "title": "Build much-select for development",
     "command": [
       "watchexec",
+      "--project-origin",
+      ".",
       "-w",
       "src",
       "--",
@@ -32,6 +34,8 @@
     "title": "Build HTML for demo/sandbox site",
     "command": [
       "watchexec",
+      "--project-origin",
+      ".",
       "-w",
       "site",
       "-w",
@@ -61,6 +65,8 @@
     "title": "Elm tests",
     "command": [
       "watchexec",
+      "--project-origin",
+      ".",
       "-w",
       "src",
       "-w",
@@ -82,6 +88,8 @@
     "title": "Build much-select for production",
     "command": [
       "watchexec",
+      "--project-origin",
+      ".",
       "-w",
       "src",
       "--",
diff --git a/src/MuchSelect.elm b/src/MuchSelect.elm
index a345dfa..d7e29e6 100644
--- a/src/MuchSelect.elm
+++ b/src/MuchSelect.elm
@@ -1611,7 +1611,7 @@ update msg model =
                     )
 
                 "selected-value" ->
-                    case SelectedValueEncoding.stringToValueStrings model.selectedValueEncoding newAttributeValue of
+                    case SelectedValueEncoding.stringToValueStrings model.selectionConfig model.selectedValueEncoding newAttributeValue of
                         Ok selectedValueStrings ->
                             if OptionList.selectedOptionValuesAreEqual selectedValueStrings model.options then
                                 ( model, NoEffect )
@@ -3436,7 +3436,7 @@ init flags =
                 |> Result.withDefault SelectedValueEncoding.defaultSelectedValueEncoding
 
         ( initialValues, initialValueErrEffect ) =
-            case SelectedValueEncoding.stringToValueStrings selectedValueEncoding flags.selectedValue of
+            case SelectedValueEncoding.stringToValueStrings selectionConfig selectedValueEncoding flags.selectedValue of
                 Ok values ->
                     ( values, NoEffect )
 
diff --git a/src/SelectedValueEncoding.elm b/src/SelectedValueEncoding.elm
index 2631d69..3201aef 100644
--- a/src/SelectedValueEncoding.elm
+++ b/src/SelectedValueEncoding.elm
@@ -5,7 +5,7 @@ import Json.Encode
 import Option exposing (Option)
 import OptionList exposing (OptionList)
 import Ports exposing (valueDecoder, valuesDecoder)
-import SelectionMode exposing (SelectionMode)
+import SelectionMode exposing (SelectionConfig(..), SelectionMode)
 import Url exposing (percentDecode, percentEncode)
 
 
@@ -59,8 +59,8 @@ toString selectedValueEncoding =
             "json"
 
 
-stringToValueStrings : SelectedValueEncoding -> String -> Result String (List String)
-stringToValueStrings selectedValueEncoding valuesString =
+stringToValueStrings : SelectionConfig -> SelectedValueEncoding -> String -> Result String (List String)
+stringToValueStrings config selectedValueEncoding valuesString =
     if valuesString == "" && selectedValueEncoding == CommaSeperated then
         Ok []
 
@@ -70,7 +70,12 @@ stringToValueStrings selectedValueEncoding valuesString =
     else
         case selectedValueEncoding of
             CommaSeperated ->
-                Ok (String.split "," valuesString)
+                case config of
+                    SingleSelectConfig _ _ _ ->
+                        Ok [ valuesString ]
+
+                    MultiSelectConfig _ _ _ ->
+                        Ok (String.split "," valuesString)
 
             JsonEncoded ->
                 percentDecode valuesString