calculate errors_options one time in validate_each

errors_options is calculated for every *CHECKS* but it could be
calculated one time  because options and RESERVED_OPTIONS
not change during this cycle

activemodel/lib/active_model/validations/length.rb

@@ -36,12 +36,12 @@ def check_validity!
       def validate_each(record, attribute, value)
         value = tokenize(value)
         value_length = value.respond_to?(:length) ? value.length : value.to_s.length
-
+        errors_options = options.except(*RESERVED_OPTIONS)
+        
         CHECKS.each do |key, validity_check|
           next unless check_value = options[key]
           next if value_length.send(validity_check, check_value)
 
-          errors_options = options.except(*RESERVED_OPTIONS)
           errors_options[:count] = check_value
 
           default_message = options[MESSAGES[key]]