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I am wondering if I have found a minor bug with LWCs. I have noticed that row numbers in a data table are turned on if one of the columns is set to "Editable" even if the "show-row-number-column" isn't present.

I have created a simple playground (linked below) to illustrate this potential bug. Note, that "show-row-number-column" isn't on the data table yet the row numbers are displayed. As soon as you set all of the columns to editable:false the row number will go away.

This may be the expected behavior, but I couldn't find it documented anywhere. Of course, this isn't a big deal at all, but for my specific use case, it does make it a little confusing for the end-user. 

 <!-- Note how "show-row-number-column" isn't selected 
    yet the row numbers are still dislayed -->
    <lightning-datatable
            key-field="id"
            data={data}
            columns={columns}>
    </lightning-datatable>

https://developer.salesforce.com/docs/component-library/tools/playground/qRYnNX2ci/6/edit

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This is an expected behavior and is documented:

By making a column editable, the show-row-number-column attribute is always true and the number column is displayed.

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    Thanks, I definitely didn't recall that line in the error section. It does make sense that the row numbers are required since the errors reference the numbers.
    – Tim Wilson
    Commented Oct 7, 2019 at 19:23

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