Our project custom field is an integer. When we update its value, we get an error message if we enter letters (that's fine) but we can enter and save spaces.
A string composed of spaces should not be authorized.

When the custom_value table contains wrong spaces values, it breaks some requests on custom fields because the current requests cast the values to decimals (like in the sql_for_field method in the query class).

Environment:
Redmine version 2.5.0.devel.12927
Ruby version 1.9.3-p484 (2013-11-22) [x86_64-darwin13.0.0]
Rails version 3.2.17
Database adapter PostgreSQL 9.3