Length/Type field in MAC frames

Hi i have a problem with MAC frames.
Suppose you have to build a MAC frame  which has to transmit a bunch of data
with a length value less than 46 octets.
The MAC layer has to put a pad in order the frame can reach the minimum
length value of 46.
But in that case...¿Which value will you put in the length / type field of
the frame (suppose that the meaning of the field is the length one)??: 46 or
the real value of the data?

Many thanks

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