You're seeing just the function encode, go back to Mnemonex module for more information.
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encode(input, server \\ :mnx_coder)

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encode(binary() | pos_integer(), term()) :: binary()

encode a binary

Unsigned big-endian integers may also be encoded, but note that there is presently no affordance to decode them back to same.

The output format depends on configuration variables (described therein.)