Allow non-string dict key types

lib/bus.js

@@ -419,7 +419,7 @@ class MessageBus extends EventEmitter {
     try {
       await this._addMatch(nameOwnerMatchRule);
     } catch (error) {
-      this.emit("error", error);
+      this.emit('error', error);
       return;
     }
 

lib/marshall-compat.js

@@ -110,8 +110,25 @@ function jsToMarshalFmt (signature, value) {
       if (value.constructor !== Object) {
         throw new Error(`expecting an object for signature '${signatureStr}' (got ${typeof value})`);
       }
-      for (const k of Object.keys(value)) {
+      for (let k of Object.keys(value)) {
         const v = value[k];
+        // js always converts keys of objects to string
+        // convert them back if the signature requires it
+        keyType = signature.child[0]?.child[0]?.type;
+        if (['y', 'n', 'q', 'i', 'x', 't'].includes(keyType)) {
+          // key should be integer
+          try {
+            k = parseInt(k);
+          } catch (e) {
+            throw new Error(`error parsing dict key for signature '${signatureStr}' (key: ${key})`);
+          }
+        } else if (['b'].includes(keyType)) {
+          // key should be boolean
+          if (!(k === 'true' || k === 'false')) {
+            throw new Error(`error parsing dict key for signature '${signatureStr}' (key: ${key})`);
+          }
+          k = k === 'true';
+        }
         if (v.constructor === Variant) {
           result.push([k, jsToMarshalFmt(v.signature, v.value)]);
         } else {