ap_get_brigade question

[Jim Carlson]

Howdy,
  I have a question in the same vein as my last post.  Can I rely on 
ap_get_brigade(mode=AP_MODE_READBYTES, len=X) to return a brigade of length no 
greater than X?  It would appear not, which means I need to be prepared to set 
aside extra bytes...  But I thought this was exactly what the supplying filter 
was supposed to do!  Confirmation requested.

Thanks!

Jim