price feed, with expiration and medianizer poke
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A price-feed contract is a ds-value like contract that stores its value as a wad, that is, a uint128 that is expected to be in 18 decimal fixed point notation. When read, it is read as a bytes32 to maintain compatibility with ds-value.
It implements poke but also post which in addition to updating its value, will poke a medianizer.
price feed, with expiration and medianizer poke