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John Pryce wrote:
In my position paper I said I preferred not to have bare-interval NaI (on performance grounds, but I may have read the trend of the relevant discussion wrongly).But we need DNaI [Nate, you may be shouting NO! but bear with me], because we need decorated-interval constructors, and we have to return _something_ when construction goes wrong. Suppose Matlab is used (so there is no "compile time", any relevant errors happen at run time). Construct a valid interval:
Look at how it is done in my solution of your decorations challenge. there is exactly one decorated interval denoting your DNaI, namely the x with x.inf=x.sup=NaN and x,dec=4. Thus decorations satisfy your wishes. Arnold Neumaier