treat Pair as broadcast scalar #32209
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stevengj
added
broadcast
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Yeah, this is probably the way to go here. It's unlikely that it's useful to broadcast the same function over both sides of the pair. It is definitely breaking, though. |
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CI failures are unrelated #32186. |
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Comment from triage (Jeff): it's probably not great that pairs are even iterable and we probably only allow it for destructuring. Triage is in favor of changing this. |
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Rebased to fix NEWS conflict. Should be good to merge. |
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I'm going to go ahead and merge shortly since triage was in favor and no one has objected to this; it seems to have fallen under the radar. |
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As discussed on discourse, it seems much more useful to treat
Pairas a scalar for broadcast. (There are other iterable objects, e.g.String, that are also broadcast scalars.)The example on the mailing list was
replace.(["string1", "string2", ...], pat=>rep), and one can come up with many others. Conversely, I find it hard to imagine any case where iterating over the pair would be useful in a broadcast context, especially since the output is an array rather than anotherPair:Hence I'm marking this as a "minor change" — technically breaking, but unlikely to affect real code.