question regarding gm_set_acceptable_sizes() function

Question regarding gm_set_acceptable_sizes() function...

The documentation says that this function uses one mask to represent
all acceptable messages sizes, so can I use buffers that are not
2^n bytes in size, or do I restrict my sizes to powers of 2?

eg. I have a buffer size that is 16 bytes and a buffer that is 4 bytes, so
the mask is 0...010100 in binary. This tells the GM API to immediately
reject all other sizes, yes?. So how can this work if the buffers are
not 2^n bytes long?

I am also assuming that the buffer size is the message size, not the
actual memory allocation returned by gm_max_length_for_size().

Now I can also interprete this function as saying that I can accept
messages that are not the same size as the buffer if the mask bit is
set appropriately, for example: I have a 16 byte buffer, and I will
also allow message sizes 2,4 and 8 (but not 1) to use the buffer so the
mask is 0...011110 I do not think that is is correct though as the 
documentation says that GM will only accept messages that are exactly
the same size as the buffer. Please confirm this though.

Thank you,
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