Binary comprehensions

[Jay Nelson]

Has anyone requested binary comprehensions?  Something like the following:

{ok, FileInput} = file:read_file("example.txt"),

Lowercase = << downcase(Char) || Char <- FileInput >>,
Printables = << R || R <- Lowercase, R > 32 >>,
HexNybbles = << integer(Byte) || Byte:4/binary <- FileInput >>,
Inverse = << flip(Bit) || Bit:1/binary <- FileInput >>,
...



Has the following restriction been lifted?

|Size| must be an integer literal, or a previously bound variable. Note 
that the following is not allowed:

foo(N, <<X:N,T/binary>>) ->
  {X,T}.