Some new traits happened.

I'll have a look.
 
Not there is a way to peek at function parameter identifiers (!):
http://dlang.org/phobos/std_traits.html#.ParameterIdentifierTuple

I cannot find it.

Hmm, Jacob linked here:

http://dlang.org/traits.html#parameterNames

I cannot find it also. Undocumented?
 

+ something else I might forgot in std.traits, it's worth revisiting

I don't think I wrote something on std.traits per se (I dealt with __traits), but I'll see. 
 
+ isPOD in compiler's __traits

Ah yes. This one is quite new.