errors

var (
	ErrKeyEmpty            = errors.New("key cannot be empty")
	ErrValueNil            = errors.New("value cannot be null")
	ErrDBNotInit           = errors.New("database not initialized")
	ErrFileNameEmpty       = errors.New("filename cannot be empty")
	ErrAlreadySave         = errors.New("save operation already in progress")
	ErrDirtyThresholdCount = errors.New("DirtyThresholdCount is greater than '0'")
	ErrDirtyThresholdRatio = errors.New("DirtyThresholdRatio is '0 ~ 1'")
	ErrFloatSpecial        = errors.New("Invalid Error: result is Nan(Not a Number) or Infinity")
)