digest: add ExtendableOutputDirty
and VariableOutputDirty
traits
#183
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Adds traits which provide an implementation-focused low-level API similar to the
FixedOutputDirty
trait introduced in #180, but for theExtendableOutput
andVariableOutput
traits.Like
FixedOutputDirty
, these traits have blanket impls when the same type also impls theReset
trait.Also adds corresponding
*_reset
methods to the respectivefinalize*
methods of these traits.