Agreed that the ones you are definitely going to speak with are easy to identify. I like to err on the side of giving anyone borderline at least a conversation or request for more info.
The "especially if they have been playing around with the languages/frameworks we use" comment hit home a bit. Part of that may be just the asset of exposure to those technologies the hiring company uses (hitting the ground not quite running), but I've had a few clients that seemed to use interest and curiosity in their languages/tools as an indicator of a likemindedness which was viewed as a strong positive. Particularly in the FP world.
The "especially if they have been playing around with the languages/frameworks we use" comment hit home a bit. Part of that may be just the asset of exposure to those technologies the hiring company uses (hitting the ground not quite running), but I've had a few clients that seemed to use interest and curiosity in their languages/tools as an indicator of a likemindedness which was viewed as a strong positive. Particularly in the FP world.