Don't check if persisted is defined just initialize it properly

activerecord/lib/active_record/base.rb

@@ -1368,7 +1368,7 @@ MSG
       def initialize(attributes = nil)
         @attributes = attributes_from_column_definition
         @attributes_cache = {}
-        @persited = false
+        @persisted = false
         @readonly = false
         @destroyed = false
         @marked_for_destruction = false

activerecord/lib/active_record/persistence.rb

@@ -4,7 +4,6 @@ module ActiveRecord
     # Returns true if this object hasn't been saved yet -- that is, a record
     # for the object doesn't exist in the data store yet; otherwise, returns false.
     def new_record?
-      @persisted = false unless defined?(@persisted)
       !@persisted
     end
 
@@ -16,7 +15,6 @@ module ActiveRecord
     # Returns if the record is persisted, i.e. it's not a new record and it was
     # not destroyed.
     def persisted?
-      @persisted = false unless defined?(@persisted)
       !!@persisted && !destroyed?
     end
 

activerecord/lib/active_record/transactions.rb

@@ -299,7 +299,6 @@ module ActiveRecord
       @_start_transaction_state ||= {}
       unless @_start_transaction_state.include?(:persisted)
         @_start_transaction_state[:id] = id if has_attribute?(self.class.primary_key)
-        @persisted = false unless defined?(@persisted)
         @_start_transaction_state[:persisted] = @persisted
       end
       unless @_start_transaction_state.include?(:destroyed)