Brendan Eich wrote:
I will take the charge of "contrived" but still maintain that -1 rather than undefined can be useful (as in used in a further index computation), while undefined either needs a test to special-case (and avoid hard-to-see implicit conversion), or else a conversion to NaN that happens to work (a "good" implicit conversion? Not in your book, I'm sure!).
Also, the monotyped approach is easier to optimize, all else equal. See http://qfox.nl/weblog/265 for testimony about this (find "JIT mixed messages").
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