Mark Wiebe wrote:
> 1) NA vs IGNORE and bitpattern vs mask are completely independent. Any 
> combination of NA as bitpattern, NA as mask, IGNORE as bitpattern, and 
> IGNORE as mask are reasonable.

Is this really true? if you use a bitpattern for IGNORE, haven't you 
just lost the ability to get the original value back if you want to stop 
ignoring it? Maybe that's not inherent to what an IGNORE means, but it 
seems pretty key to me.

-Chris








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