[GROOVY-4018] Make the Groovy truth value of NaN be false - ASF JIRA

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Similar to null and empty-string, have Groovy evaluate NaN as false rather than true.

def result = a?.b?.calcX(...)
if (result) { 
  // now I have a valid non-null number
}

This is how JavaScript treats NaN and like other Groovy design choices, it just makes sense.

That is, if NaN was false the following should work:

assert !(Double.NaN)

assert !((Double.NaN as Boolean) == true)

assert ((Double.NaN as Boolean) == false)

is related to

GROOVY-3309 comparisons with NaN should always return false

relates to

GROOVY-4906 Double.NaN == Double.Nan should evaluate to false

links to

GitHub Pull Request #409