miniredis

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Hi! First of all, thanks for a very useful library.

This adds support for the NOMKSTREAM option for XADD as specified by https://redis.io/docs/latest/commands/xadd/

XADD key [NOMKSTREAM] [<MAXLEN | MINID> [= | ~] threshold [LIMIT count]] <* | id> field value [field value ...]

What the option does:

If the key does not exist, as a side effect of running this command the key is created with a stream value. The creation of stream's key can be disabled with the NOMKSTREAM option.

And the response when the option is provided:

Nil reply: if the NOMKSTREAM option is given and the key doesn't exist.

Thanks! I'll have a look soon.

thanks!