TreeBuildSpec
data class TreeBuildSpec(val buffer: TreeBuildBuffer, val nodeSet: NodeSet, val topID: Int, val start: Int = 0, val bufferStart: Int = 0, val length: Int? = null, val maxBufferLength: Int = DEFAULT_BUFFER_LENGTH, val reused: List<Tree> = emptyList(), val minRepeatType: Int = -1)
Build specification for tree construction from a buffer cursor or flat buffer.