I'm a fairly new postdoc, about to meet with another new postdoc in my field for a coffee. I'm really excited to share one particular idea for a grant proposal with them, as I think they could be an ideal collaborator on this proposal. However I've never met this person before, and despite all appearances being favourable, I am worried that they could take the idea and run with it.
What are some ways to ensure that this doesn't happen? I want to be able to share the idea without risk of being scooped, but also without being too precious with my idea (I know it's just an idea at this stage, but I still think it could have legs).