patch - mysql double datatype

while porting some parts of our java-based plattform to rails i
encounter some problems while using migrations and db:schema:dump. the
database schema uses several "double" column types which are not
supported natively in activerecord ... as far as i know ... and i
cannot change the database schema.

from some blogs i know that "t.float :mycolumn :limit => 53" results
in a generated column of type double.

this solved 50% of my problem, but running a "rake db:schema:dump"
ignores the "limit 53" which will generate an invalid schema on next
run of "rake db:schema:load".

i think if found the relevant part in the mysql_adapter.rb to patch
this, but it would be great if some more experienced rails people
could confirm this.

regards
jan

*** mysql_adapter.orig.rb 2009-01-19 12:09:58.000000000 +0100
--- mysql_adapter.rb 2009-01-19 11:59:18.000000000 +0100