One thing we really need in order to 100% replace string lambdas with lambdas is function equivalence.
One significant - but undocumented - feature of unaryFun and binaryFun, is that they will auto-import the following modules if needed:
import std.traits, std.typecons, std.typetuple;
import std.algorithm, std.conv, std.exception, std.math,
std.range, std.string;
Does anyone actually use this feature?
