ASDF components are brittle for backwards compatibility

[Robert Goldman]

On 29 Apr 2021, at 19:42, Stelian Ionescu wrote:

> On Thu, 2021-04-29 at 18:58 -0500, Robert Goldman wrote:
>> On 29 Apr 2021, at 13:38, Marco Antoniotti wrote:
>>
>>> Robert, it was you who suggested to use it if I remember correctly.
>>>
>>> How would it be different from what you just proposed?
>>
>> My suggestion to use the `:properties` slot was not a good
>> one.  Looking
>> at the code, this slot is clearly marked as being only for ASDF 2
>> backwards compatibility (it's hard for me to believe that this is
>> even an issue any more).
>
> Then you can safely un-deprecate it. Unless there is a clear reason to
> think that using that slot would break existing systems, there's no
> reason to add another slot.
>
> -- 
> Stelian Ionescu a.k.a. fe[nl]ix
> Quidquid latine dictum sit, altum videtur.

Yeah, I am being lazy.  I need to see what is being done with the 
current `properties` slot and whether it can be taken over, or if it is 
doing some weird classic ASDF thing that I need to stay away from.

I will post more once I have groveled over the code.
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