Re: [Pyobjc-dev] Auto bridging instances by conversion

[Just v. R. <ju...@le...>]

Ronald Oussoren wrote:

> > I don't see why the id should matter either. From a Python
> > perspective, all that matters is that the two objects compare and
> > hash equally. Sure, comparison is _cheaper_ when the two objects
> > have the same id, but would stuff actually _break_ if the id's
> > weren't the same? That's just sick.
> 
> Not necessarily, I'm sure we can come up with sane scenarios where 
> object identity is used other than as a performance hack.

Sure, eg. in Python this happens with exceptions. However we're not
talking about arbitrary objects, but about real basic immutable types
(strings and numbers). I claim that any code in which the id of an
NSNumber or NSString is important is seriously broken.

> > Regarding numbers: from ObjC -> Python there will be hardly a
> > difference between conversion and wrapping: for both cases a new
> > object needs to be allocated (except when the number is between -1
> > and 99 in which case conversion is _cheaper_).
> And likewise for Python->ObjC: A new object will be created.

Not for a wrapped NSNumber, when you would just pass the original object
back.

Just