On Jan 26, 2023, at 9:36 AM, Brian Goetz <[email protected]<mailto:[email protected]>> wrote:
... For comparing a variable to a constant, representational equality is the obvious interpretation; `case nnn` means "is it the number nnn". This allows you to say `case NaN` and `case -0` and get the right answer (all of these relations agree on what to do about 1.0). Careful: I think you had better say “case -0.0”; otherwise the constant expression “-0” will be reduced to “0” and only then converted to floating-point representation, producing +0.0. Yes, floating-point is VERY fiddly. —Guy
