Validate this module's field data.
So the idea is that it's only invoked for the module that implements a particular field, which makes sense.
Unfortunately there's no altering mechanism in place (that I can find) so the implementations of those hooks are pretty much hard-coded. Also the hook is never run through
module_implements() (as you would expect), so in turn is not available to be overridden using
Does anyone know of a way, however unclean, of overriding
hook_field_validate() for a particular field implementation, without hacking any core/contrib modules?