Making sense of 4-byte binary fields

I may be going against the grain here, but if the documentation says 
4-byte binary I just specify 4-byte binary in my code, as shown below, 
which works just fine, and the way we always used to define binary fields 
prior to RPGIV.

0085.00 D                 DS 
0086.00 D  MSGDLN                 1      4B 0 

The problem lies if you code the field using the new sexy type 'S' for a 
standalone field, when you only get the opportunity to specify the number 
of DIGITS, rather than bytes.

So, keep your 4Bs, but remember to code the field as part of a data 
structure, not a standlone field. This way, the numbers do appear to make 
sense!(And we don't need to know that the machine can get 10 digits in 4 
bytes!)

Hope this provides some illumination...