Once you see this, the bug categories in the study become predictable rather than surprising. Every classic failure mode of shared mutable state has a channel equivalent:
В российском городе дерево рухнуло на жилой дом20:51
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Что думаешь? Оцени!，详情可参考哔哩哔哩
They allow exits. Have been running multiple for a few months without problems
It's perfectly valid to add input filtering on top of type=email if you want to further restrict the input set. Maybe you hate people with gmail addresses or only want to allow email addresses at your local firm (both examples from before!). In that case, having a more restrictive pattern makes sense.