Merge branch 'master' into develop

src/Models/ThemeConfig/LayerConfig.ts

@@ -277,10 +277,9 @@ export default class LayerConfig extends WithContextLoader {
                 ".units: the 'units'-section should be a list; you probably have an object there"
             )
         }
-        this.units = [].concat(
-            ...(json.units ?? []).map((unitJson, i) =>
+        this.units = (json.units ?? []).flatMap((unitJson, i) =>
                 Unit.fromJson(unitJson, this.tagRenderings, `${context}.unit[${i}]`)
-            )
+
         )
 
         if (

src/Models/Unit.ts

@@ -27,6 +27,10 @@ export class Unit {
     ) {
         this.quantity = quantity
         this._validator = validator
+        if(!inverted && ["string","text","key","icon","translation","fediverse","id"].indexOf(validator.name) >= 0){
+            console.trace("Unit error")
+            throw "Invalid unit configuration. The validator is of a forbidden type: "+validator.name+"; set a (number) type to your freeform key or set inverted. Hint: this unit is applied onto keys: "+appliesToKeys.join("; ")
+        }
         this.inverted = inverted
         this.appliesToKeys = new Set(appliesToKeys)
         this.denominations = applicableDenominations