Is true iff F returns a value whose mutable indirections are unique.
TODO: Check if the uniqueness property only applies to the first indirection layer. TODO: Move to Phobos std.traits.
https://dlang.org/changelog/2.101.0.html#dmd.fix-immutable-conv
See Implementation
Is true iff F returns a value whose mutable indirections are unique.
TODO: Check if the uniqueness property only applies to the first indirection layer. TODO: Move to Phobos std.traits.