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Of course NaN is a number
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| user=> (/ 0.0 0.0) | |
| NaN | |
| user=> (type (/ 0.0 0.0)) | |
| java.lang.Double |
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| irb(main):001:0> 0.0/0.0 | |
| => NaN | |
| irb(main):002:0> (0.0/0.0).class | |
| => Float |
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| > 0.0 / 0.0 | |
| NaN | |
| > typeof(0.0 / 0.0) | |
| 'number' |
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| > return (0.0 / 0.0) | |
| nan | |
| > return type(0.0 / 0.0) | |
| number |
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<3