They can not be displayed by all clients (nor OS).
But also they can be trimmed automatically by web input which breaks comparison
against changes.
issue9248
review312681002
This changeset defines on the field the (somehow) abstract SQL type a field
should use letting the duty of specifying the real SQL type the database
supports and the conversion to/from the python types to the backend.
issue6351
review33951002
* Use python-sql
* Add convert_domain method on Fields
* Add sql_format and sql_type methods on Fields
* Allow to return a full domain for Function.searcher
* Replace static backend by dynamic get method
* Replace order_field by order_<field name> method
review1001002
Cédric Krier