Re: sqlite3

[Qiantan Hong]

> Richard Stallman <rms@gnu.org> writes:
> 
>> That's what I'd call "perserving EQ-ness" (within the structure).
>> And that is what you would get by binding print-circle to t before
>> printing the data.
>> 
>> Given that we already offer print-circle, why do we need to worry
>> further about this issue?  Is there really a need for some other
>> option intermediate between print-circle = t and print-circle = nil?
> 
> The discussion was about Quintan's proposed list logging feature, which
> doesn't write out a list in one go, but outputs it element by element.
> I was pointing out that this doesn't allow using `print-circle'.
I was indeed pointing out there is an intermediate that already happened.
It’s when you do print-circle=t in a key value store.
In such case, EQ-ness within value is preserved, but between different
keys are lost. i.e., if you store the same object into two different keys,
and read them back, potentially the values you get are no longer EQ.

Therefore I conclude that maybe preserving EQness in persistent store
does not make that much sense (otherwise why it can only be preserved
partially?).

I do see practical usefulness of partial EQness preservation.