Associations, find and options hash

Hi, I’ve observed that finds over associations modify the options
hashed passed to them:

class Parent < ActiveRecord::Base
has_many :sons

def something_about_sons
options = { :conditions => “id < 10” }
logger.info options
s = sons.find(:all, options)
logger.info options
s
end
end

The options hash passed to find is not being dupped, is this the
expected behaviour (Rails 1.2.3)?

Thanks