def _get_decimal128(data, position, dummy0, dummy1, dummy2):
 end = (position + 16)
 return (Decimal128.from_bid(data[position:end]), end)

def _get_decimal128 ( data , position , dummy0 , dummy1 , dummy2 ) : end = ( position + 16 ) return ( Decimal128 . from_bid ( data [ position : end ] ) , end )
decode a bson decimal128 to bson .