Is your feature request related to a problem? Please describe.
In WeakAuras version 4.0.2-50-g0e49842 for WotLK the API check if a cast is Interruptible does not currently exist in the WeakAura interface panel for the Cast trigger.
It was added in patch 3.2, and is accessible on beta/ptr through custom code, but currently isn't accessible to the WeakAura interface for the Cast trigger, but exists in retail.

Describe the solution you'd like
Add the checkbox that currently exists in retail:

Describe alternatives you've considered
Custom code for UnitCastingInfo, but would rather see it implemented properly.

Additional context
https://wowwiki-archive.fandom.com/wiki/API_UnitCastingInfo

/dump UnitCastingInfo("player") seems to always return false as 9th arg (tested with greater heal & flamestrike)

I have submitted a bug report ingame instead, and hope that Blizzard adds this back in.

@mrbuds
The API works opposite of how we both thought. It returns true if the cast is notInterruptible, such as when a Paladin is casting during Divine Shield:

Perhaps reopen this, as it does work as intended, and hopefully can be added to the WeakAuras UI for Wrath.

Indeed i was not paying attention, thank you