Default statedescription pattern for NumberItem about openhab-core HOT 4 CLOSED

First you have to understand in which cases this default pattern will be used, there are only two cases:

1. you have an item that is not linked to any channel and of course without any pattern defined on the item itself
2. you have an item linked to a channel but the binding developer made a bad decision and did not define a default pattern for this channel, and of course without any pattern defined on the item itself

Additionally, for the second case (no pattern defined by the channel), I can also tell you that the default %.0f was there since many many years.

So yes, if you link one item to a channel, the channel provider should provide a proper default pattern and this default would be for example "%.1f %unit%" for a temperature. In case the channel does not provide a default pattern, you can of course define one on your item if the default does not match your need.

In practice, this default pattern is mainly for items that the user do not link to any channel.

from openhab-core.

And to answer to your question, the %.0f was chosen for two reasons:

1. It was the value requested in the feature request
2. It made sense to maintain a backward compatibility due to previous default pattern set on channel level.

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It was the value requested in the feature request

I have not thought on the number of digits, but have seen this is default value somewhere. The rationale is that some value has to be selected as default.

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Thanks for the explanation.

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