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package pack
// Chain represents an element in the delta-base chain corresponding to a packed
// object.
type Chain interface {
// Unpack unpacks the data encoded in the delta-base chain up to and
// including the receiving Chain implementation by applying the
// delta-base chain successively to itself.
//
// If there was an error in the delta-base resolution, i.e., the chain
// is malformed, has a bad instruction, or there was a file read error, this
// function is expected to return that error.
//
// In the event that a non-nil error is returned, it is assumed that the
// unpacked data this function returns is malformed, or otherwise
// corrupt.
Unpack() ([]byte, error)
// Type returns the type of the receiving chain element.
Type() PackedObjectType
}
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