[Fix] splitKeyIntoSegments: improve comment clarity on handling unterminated groups

Author: techouse

lib/parse.js

@@ -269,7 +269,8 @@ var splitKeyIntoSegments = function splitKeyIntoSegments(originalKey, options) {
         }
 
         if (close < 0) {
-            // Unterminated group: wrap the raw remainder once as a single literal segment
+            // Unterminated group: wrap the raw remainder in one bracket pair so it stays
+            // a single literal segment (e.g. "[[]b" -> "[[]b]"); we do not infer missing ']'.
             segments[segments.length] = '[' + key.slice(open) + ']';
             return segments;
         }