Add hooks for new data types

I work on plugin, which allows use of PostgreSQL array type.
While modifying it to work under Rails 3, i found two places, where need for "monkey patching" was too big. Both places are about deciding what to insert into SQL depending on value type.

First place is ActiveRecord::Base#arel_attributes_values .
It would be perfect, if rows

  if value && ((self.class.serialized_attributes.has_key?(name) && (value.acts_like?(:date) || value.acts_like?(:time))) || value.is_a?(Hash) || value.is_a?(Array))
    value = value.to_yaml
  end

would be refactored into hookable method. I suggest, it could be method in the ActiveRecord::ConnectionAdapters::AbstractAdapter

  if value && self.class.serialized_attributes.has_key?(name)
    value = value.to_yaml
  else
    value = self.class.connection.arel_attribute_value(value, column)
  ends

  module ActiveRecord
    module ConnectionAdapters
      class AbstractAdapter
        def arel_attribute_value( value, column )
          if value && ((value.acts_like?(:date) || value.acts_like?(:time)) || value.is_a?(Hash) || value.is_a?(Array))
            value.to_yaml
          else
            value
          end
        end
      end
    end
  end

or simply in separated ActiveRecord::Base method, depended on column

Second is ActiveRecord::PredicateBuilder#build_from_hash
Could following lines be refactored in separate method:

  case value
  when Array, ActiveRecord::Associations::AssociationCollection, ActiveRecord::Relation
    values = value.to_a
    attribute.in(values)
  when Range, Arel::Relation
    attribute.in(value)
  else
    attribute.eq(value)
  end