Re: [w3c/IndexedDB] Clarify the handling of +0 and -0 in keys (Issue #375)

> Currently, according to the spec, both `+0` and `-0` are valid keys. So, when a value is stored with the key `-0`, a later call to `getAllKeys` should return `-0` as the key. However, some implementations instead are replacing `-0` with `+0`.
> 
> Also, given that `-0 == +0`, an object store or a unique index can have either `-0` or `+0` as a key, but not both.
> 
> The value `+0` or `-0` can be the whole key, or a (possibly nested) array element of the key.
> 
> I think that the spec should be clarified to note the existence of equal but different keys, and to provide examples of correct behavior (e.g. `put` replacing an entry with a different key).



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