Optimize PathSet

Performance has not been tested but generally avoiding sparse arrays
should result in better performance.

lib/session.js

@@ -1808,12 +1808,11 @@ function processDeclarations(
   const syncState = sessionContext.syncState;
 
   const root = sessionContext.deviceData.paths.add([]);
-  const paths = sessionContext.deviceData.paths.find([], false, true, 99);
-  paths.sort((a, b) => {
-    if (a.wildcard === b.wildcard) return a.length - b.length;
-
-    return a.wildcard - b.wildcard;
-  });
+  const paths = deviceData.paths.find([], false, true, 99);
+  paths.sort(
+    (a, b) =>
+      a.wildcard === b.wildcard ? a.length - b.length : a.wildcard - b.wildcard
+  );
 
   const virtualParameterDeclarations = [];
 
@@ -1885,7 +1884,8 @@ function processDeclarations(
       leafIsObject = currentAttributes.object
         ? currentAttributes.object[1]
         : null;
-      if (leafIsObject === 0)
+      // Possible V8 bug causes null === 0
+      if (leafIsObject != null && leafIsObject === 0)
         leafTimestamp = Math.max(leafTimestamp, currentAttributes.object[0]);
     } else {
       leafTimestamp = Math.max(leafTimestamp, currentTimestamp);