I just found out that the number input node sends a message after each digit, not only after leaving focus or pressing enter, though they are ticked. In the old Dashboard there were a delay option.
Is that normal or a bug? If this is normal can it be changed somehow?
You are right. It needs a Send after Delay option. This is a serious deficiency in the node as it effectively makes the node useless for entering anything other than single digit numbers. I have submitted a feature request, but I think there is little manpower available for working on the dashboard so it may be some time before it is addressed.
In the meantime a workaround is to add a trigger node after the input node, configured as below, which achieves the same effect as Send after Delay, except that it also delays the messages sent on focus leave or Enter.