code: func newMergePolicyImpl(self MergeSpecifier, defaultNoCFSRatio, defaultMaxCFSSegmentSize float64) *MergePolicyImpl {
  	ans := &MergePolicyImpl{
  		self:              self,
  		noCFSRatio:        defaultNoCFSRatio,
  		maxCFSSegmentSize: defaultMaxCFSSegmentSize,
  	}
  	ans.SizeSPI = ans
  	return ans
  }
docs: /*
  Create a new merge policy instance with default settings for noCFSRatio
  and maxCFSSegmentSize. This ctor should be used by subclasses using
  different defaults than the MergePolicy.
  */