find_each ignores limit

The following code iterates over the entire table, ignoring the limit scope:

klass.limit(3).find_each {|obj| puts obj.to_s}

In ActiveRecord 2.3, one could iterate over the first 3000 of 10000 records without loading all 3000 at once. In ActiveRecord 3.0, this is not possible.

find_each works with all other scope methods, so silently discarding limit scopes is inconsistent behavior. I suggest one of two options:

1. find_each should ignore limits but issue a warning;
   
2. find_each should behave as under ActiveRecord 2.3 and use the limit.