Is there an actual decision about this, or will users that want to use string lambdas just have to *guess* with which functions support it, and which don't.

We either ban them, or support them *everywhere*. Supporting them only in certain functions will make a mess of things, and surprising compilation errors.

Also, I don't remember the consensus that said phobos stopped supporting them. Last I recall, string lambdas were still useful for trivial predicates. And finally, until `std.algorithm` is re-written to better actually handle pred/nopred distinctions, we can't really phase them out.

I'm just saying: Let's do this for real, officially. Or not at all.