display_if does not work with numeric values

[montchr]

On setting value to an integer or numeric-only string, I receive the following JS error when viewing the fields:

Uncaught TypeError: $(...).data(...).split is not a function in fieldmanager.js L171 in my version

If I add non-numeric characters to the value, the error does not occur (but then of course I'm unable to check for the correct value).

It looks like #418 might address this in 170f09e.

In my specific case, I'm using the term datasource, so term IDs are stored in the field. If anyone has a workaround for this case, I'd appreciate it.