Representation length of integral types

[tcak via Digitalmars-d]

There is a use case for me that I am given a string, and before 
even trying to convert it to integer, I want to check whether it 
is valid. One of the checks necessary for this is the length of 
string.

So, if I have received "156" and it should be converted to ubyte, 
I would check whether it is at most 3 bytes length.

While doing that someone would define that maximum length in the 
code, while length information is constant and never changes.

For this reason, however data types have properties like max, 
min, and init, I would ask for addition of new properties for 
integral (even for floating points as well) types as (Example 
values for ubyte):

max_hex_length = 2
max_dec_length = 3
max_bin_length = 8