fix: revert incorrectly adapted code

Author: markwhitfeld

src/parser.coffee

@@ -118,7 +118,7 @@ class exports.Parser extends events
             if @options.mergeAttrs
               @assignOrPush obj, processedKey, newValue
             else
-            @assignOrPush obj[attrkey], processedKey, newValue
+              obj[attrkey][processedKey] = newValue
 
       # need a place to store the node name
       obj["#name"] = if @options.tagNameProcessors then processItem(@options.tagNameProcessors, node.name) else node.name