Re: [w3c/IndexedDB] Rework key generator algorithm (#153)

I see one other issue...

The current number definition states the following:

> A [=key generator=] has a <dfn>current number</dfn>. The
> [=key generator/current number=] is always a positive integer less
> than or equal to 2<sup>53</sup> (9007199254740992).

However the steps to "generate a key" and "possibly update the key generator" both allow for a current number to be set to a number one higher than 9007199254740992 as does the following:

> When the [=key generator/current number=] of a key generator reaches above the
> value 2<sup>53</sup> (9007199254740992) any attempts to use the
> key generator to generate a new [=/key=] will result in a
> "{{ConstraintError}}" {{DOMException}}.

I believe the current number definition ought to be reworded, e.g., like this:

>> A [=key generator=] has a <dfn>current number</dfn>. The
> [=key generator/current number=] is always a positive integer less
> than or equal to 2<sup>53</sup> + 1 (9007199254740993).

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