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Re: fixing smartmatch just hard enough (and when, too)

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From:

David E. Wheeler

Date:

August 22, 2012 13:34

Subject:

Re: fixing smartmatch just hard enough (and when, too)

Message ID:

9C60E649-5FB8-4F9B-98DB-7E52CF5A89CA@justatheory.com

On Aug 22, 2012, at 5:59 AM, David Golden wrote:

> I'm very happy with the summary and proposal

Me too. +1

> with the exception of this piece.  Rarely in Perl do we die on ambiguity and I can't think of any case involving scalar string/number mutability.  (E.g. perldata is pretty clear about not needing to worry about such conversions.)

I think it might be time we started. In the past we avoided this by having operators to disambiguate (eq vs ==). Such is not possible here: there are no separate string and number smartmatch operators (such would defeat the purpose).

> I would prefer the Any ~~ AmbiguousScalar case to warn and fall back to string comparison.  If someone wants to die on ambiguity, they can make the warning fatal.
> 
> I think this gentler approach would be more Perlish.

And I would prefer the fatality over an easily-missed ambiguity warning. I want to know when it's doing something ambiguous ASAP, so I can fix it and move on. The fix will always be simple.

Best,

David

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