===, SameValue, or SameValueZero (Can you match NaN?)

[cesarandreu]

Do literal patterns have the same behavior as Object.is(a, b)?

Consider:

match (num) {
  -0: '-0',
  +0: '+0', 
  NaN: 'NaN',
  else: '...',
}

[ljharb]

The only options seem to be ===, SameValueZero, or SameValue (Object.is).

SameValue seems the best choice, but Map/Set have precedence for SameValueZero (which was probably the wrong choice, but it's too late to fix it now).

[bterlson]

Agree that SameValue seems like the best choice (and further that matching NaN is critical). I'll update the title a little bit.

[zkat]

Hey y'all! #65 has gotten merged, and a lot of issues have become irrelevant or significantly changed in context. Because of the magnitude of changes and subtle differences in things that seem similar, we've decided to just nuke all existing issues so we can start fresh. Thank you so much for the contributions and discussions and feel free to create new issues if something seems to still be relevant, and link to the original, related issue so we can have a paper trail (but have the benefit of that clean slate anyway).

p.s. the new spec explicitly mentions using Object.is for relevant comparisons.