Github user nickwallen commented on the issue:
https://github.com/apache/metron/pull/681
Thanks for clarifying @mattf-horton . That makes sense now that I've had
lunch.
Based on the original use case of detecting a function returning NaN, it
seems what we really need is something like `IS_NAN(x)` rather than a keyword
for `NaN`. Implementing `IS_NAN(x)` doesn't technically require a keyword for
`NaN`.
But I can see a potential use for the `NaN` keyword when creating a lambda
expression.
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